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SimpleDBMS

Implementation of a rudimentary DBMS where server and clients interact with a central database

There are 8 shell scripts. In order to test and run the DBMS, it’s highly suggested to open two terminal windows, and run server.sh in one and client.sh in another. The following is to be taken as a suggested procedure to run the whole system:

Step 1) run server.sh: the server script will enter an infinite loop to keep it running, waiting for user requests and executing all the legal ones in the background.

Step 2) run client.sh followed by a client id number in a separate terminal tab/window to enter commands. The scripts enter then an infinite loop to continuously accept legal requests from the user.

Available commands to be run at client-side:

  • create_database requires an argument as db folder name to be created

  • create_table: requires 3 arguments —> db directory valid name, table valid name and column names to be generated (comma-separated).
    E.g.: database1 table1 col1,col2,col3

  • insert requires 3 arguments —> db directory valid name, table valid name, tuple values to insert in existing columns.
    E.g.: database1 table1 value1,value2.value3

  • query if user enters 2 arguments it prints the corresponding table as a whole. If user inputs 3 arguments (db name, table name, column numbers to display) it displays the corresponding columns by numbers including headers.
    E.g.: database1 table1 2,3

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Implementation of a rudimentary DBMS where server and clients interact with a central database

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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SimpleDBMS
Implementation of a rudimentary DBMS where server and clients interact with a central database
There are 8 shell scripts.
In order to test and run the DBMS, it’s highly suggested to open two terminal windows, and run server.sh in one and client.sh in another.
The following is to be taken as a suggested procedure to run the whole system:
Step 1) run server.sh: the server script will enter an infinite loop to keep it running, waiting for user requests and executing all the legal ones in the background.
Step 2) run client.sh followed by a client id number in a separate terminal tab/window to enter commands. The scripts enter then an infinite loop to continuously accept legal requests from the user.
Available commands to be run at client-side:
  • create_database requires an argument as db folder name to be created
  • create_table: requires 3 arguments —> db directory valid name, table valid name and column names to be generated (comma-separated).
    
E.g.: database1 table1 col1,col2,col3
  • insert requires 3 arguments —> db directory valid name, table valid name, tuple values to insert in existing columns.
    
E.g.: database1 table1 value1,value2.value3
  • query if user enters 2 arguments it prints the corresponding table as a whole. If user inputs 3 arguments (db name, table name, column numbers to display) it displays the corresponding columns by numbers including headers.
    
E.g.: database1 table1 2,3
About
Implementation of a rudimentary DBMS where server and clients interact with a central database
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1 watching
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1 fork
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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SimpleDBMS
Implementation of a rudimentary DBMS where server and clients interact with a central database
There are 8 shell scripts.
In order to test and run the DBMS, it’s highly suggested to open two terminal windows, and run server.sh in one and client.sh in another.
The following is to be taken as a suggested procedure to run the whole system:
Step 1) run server.sh: the server script will enter an infinite loop to keep it running, waiting for user requests and executing all the legal ones in the background.
Step 2) run client.sh followed by a client id number in a separate terminal tab/window to enter commands. The scripts enter then an infinite loop to continuously accept legal requests from the user.
Available commands to be run at client-side:
  • create_database requires an argument as db folder name to be created
  • create_table: requires 3 arguments —> db directory valid name, table valid name and column names to be generated (comma-separated).
    
E.g.: database1 table1 col1,col2,col3
  • insert requires 3 arguments —> db directory valid name, table valid name, tuple values to insert in existing columns.
    
E.g.: database1 table1 value1,value2.value3
  • query if user enters 2 arguments it prints the corresponding table as a whole. If user inputs 3 arguments (db name, table name, column numbers to display) it displays the corresponding columns by numbers including headers.
    
E.g.: database1 table1 2,3
About
Implementation of a rudimentary DBMS where server and clients interact with a central database
Resources
Readme
Activity
Stars
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Watchers
1 watching
Forks
1 fork
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
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SimpleDBMS
Implementation of a rudimentary DBMS where server and clients interact with a central database
There are 8 shell scripts.
In order to test and run the DBMS, it’s highly suggested to open two terminal windows, and run server.sh in one and client.sh in another.
The following is to be taken as a suggested procedure to run the whole system:
Step 1) run server.sh: the server script will enter an infinite loop to keep it running, waiting for user requests and executing all the legal ones in the background.
Step 2) run client.sh followed by a client id number in a separate terminal tab/window to enter commands. The scripts enter then an infinite loop to continuously accept legal requests from the user.
Available commands to be run at client-side:
  • create_database requires an argument as db folder name to be created
  • create_table: requires 3 arguments —> db directory valid name, table valid name and column names to be generated (comma-separated).
    
E.g.: database1 table1 col1,col2,col3
  • insert requires 3 arguments —> db directory valid name, table valid name, tuple values to insert in existing columns.
    
E.g.: database1 table1 value1,value2.value3
  • query if user enters 2 arguments it prints the corresponding table as a whole. If user inputs 3 arguments (db name, table name, column numbers to display) it displays the corresponding columns by numbers including headers.
    
E.g.: database1 table1 2,3
About
Implementation of a rudimentary DBMS where server and clients interact with a central database
Resources
Readme
Activity
Stars
0 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
SimpleDBMS
Implementation of a rudimentary DBMS where server and clients interact with a central database
There are 8 shell scripts.
In order to test and run the DBMS, it’s highly suggested to open two terminal windows, and run server.sh in one and client.sh in another.
The following is to be taken as a suggested procedure to run the whole system:
Step 1) run server.sh: the server script will enter an infinite loop to keep it running, waiting for user requests and executing all the legal ones in the background.
Step 2) run client.sh followed by a client id number in a separate terminal tab/window to enter commands. The scripts enter then an infinite loop to continuously accept legal requests from the user.
Available commands to be run at client-side:
  • create_database requires an argument as db folder name to be created
  • create_table: requires 3 arguments —> db directory valid name, table valid name and column names to be generated (comma-separated).
    
E.g.: database1 table1 col1,col2,col3
  • insert requires 3 arguments —> db directory valid name, table valid name, tuple values to insert in existing columns.
    
E.g.: database1 table1 value1,value2.value3
  • query if user enters 2 arguments it prints the corresponding table as a whole. If user inputs 3 arguments (db name, table name, column numbers to display) it displays the corresponding columns by numbers including headers.
    
E.g.: database1 table1 2,3
About
Implementation of a rudimentary DBMS where server and clients interact with a central database
Resources
Readme
Activity
Stars
0 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
SimpleDBMS
Implementation of a rudimentary DBMS where server and clients interact with a central database
There are 8 shell scripts.
In order to test and run the DBMS, it’s highly suggested to open two terminal windows, and run server.sh in one and client.sh in another.
The following is to be taken as a suggested procedure to run the whole system:
Step 1) run server.sh: the server script will enter an infinite loop to keep it running, waiting for user requests and executing all the legal ones in the background.
Step 2) run client.sh followed by a client id number in a separate terminal tab/window to enter commands. The scripts enter then an infinite loop to continuously accept legal requests from the user.
Available commands to be run at client-side:
  • create_database requires an argument as db folder name to be created
  • create_table: requires 3 arguments —> db directory valid name, table valid name and column names to be generated (comma-separated).
    
E.g.: database1 table1 col1,col2,col3
  • insert requires 3 arguments —> db directory valid name, table valid name, tuple values to insert in existing columns.
    
E.g.: database1 table1 value1,value2.value3
  • query if user enters 2 arguments it prints the corresponding table as a whole. If user inputs 3 arguments (db name, table name, column numbers to display) it displays the corresponding columns by numbers including headers.
    
E.g.: database1 table1 2,3
About
Implementation of a rudimentary DBMS where server and clients interact with a central database
Resources
Readme
Activity
Stars
0 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
SimpleDBMS
Implementation of a rudimentary DBMS where server and clients interact with a central database
There are 8 shell scripts.
In order to test and run the DBMS, it’s highly suggested to open two terminal windows, and run server.sh in one and client.sh in another.
The following is to be taken as a suggested procedure to run the whole system:
Step 1) run server.sh: the server script will enter an infinite loop to keep it running, waiting for user requests and executing all the legal ones in the background.
Step 2) run client.sh followed by a client id number in a separate terminal tab/window to enter commands. The scripts enter then an infinite loop to continuously accept legal requests from the user.
Available commands to be run at client-side:
  • create_database requires an argument as db folder name to be created
  • create_table: requires 3 arguments —> db directory valid name, table valid name and column names to be generated (comma-separated).
    
E.g.: database1 table1 col1,col2,col3
  • insert requires 3 arguments —> db directory valid name, table valid name, tuple values to insert in existing columns.
    
E.g.: database1 table1 value1,value2.value3
  • query if user enters 2 arguments it prints the corresponding table as a whole. If user inputs 3 arguments (db name, table name, column numbers to display) it displays the corresponding columns by numbers including headers.
    
E.g.: database1 table1 2,3
About
Implementation of a rudimentary DBMS where server and clients interact with a central database
Resources
Readme
Activity
Stars
0 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
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SimpleDBMS
Implementation of a rudimentary DBMS where server and clients interact with a central database
There are 8 shell scripts.
In order to test and run the DBMS, it’s highly suggested to open two terminal windows, and run server.sh in one and client.sh in another.
The following is to be taken as a suggested procedure to run the whole system:
Step 1) run server.sh: the server script will enter an infinite loop to keep it running, waiting for user requests and executing all the legal ones in the background.
Step 2) run client.sh followed by a client id number in a separate terminal tab/window to enter commands. The scripts enter then an infinite loop to continuously accept legal requests from the user.
Available commands to be run at client-side:
  • create_database requires an argument as db folder name to be created
  • create_table: requires 3 arguments —> db directory valid name, table valid name and column names to be generated (comma-separated).
    
E.g.: database1 table1 col1,col2,col3
  • insert requires 3 arguments —> db directory valid name, table valid name, tuple values to insert in existing columns.
    
E.g.: database1 table1 value1,value2.value3
  • query if user enters 2 arguments it prints the corresponding table as a whole. If user inputs 3 arguments (db name, table name, column numbers to display) it displays the corresponding columns by numbers including headers.
    
E.g.: database1 table1 2,3
About
Implementation of a rudimentary DBMS where server and clients interact with a central database
Resources
Readme
Activity
Stars
0 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages