Linux Commands Reference - Complete Linux Command Guide
Comprehensive Linux command reference with 150+ commands. Search, filter by category, and view detailed usage examples.
expr
Evaluate expressions
Syntax
expr EXPRESSION...Common Options
ARG1 + ARG2AdditionARG1 - ARG2SubtractionARG1 \* ARG2MultiplicationARG1 / ARG2Division (integer)ARG1 % ARG2ModuloARG1 = ARG2Equal (returns 1/0)ARG1 != ARG2Not equallength STRINGString lengthsubstr STRING POS LENGTHSubstringindex STRING CHARSFirst position of charsCommon Examples
expr 2 + 3Addition
expr 10 \* 5Multiplication
expr 10 / 3Integer division
expr 10 % 3Modulo operation
expr length "hello"Calculate string length
expr substr "hello" 2 3Extract substring
x=5; expr $x + 10Variable in expression
expr "abc" = "abc"String comparison
Related Tools
More Code & Dev Tools
Git Commit Message Generator
Generate standardized Git commit messages following Conventi...
Color Shades & Tints Generator
Generate shades, tints, and tones from any base color. Expor...
Nginx Config Generator
Generate Nginx configuration files visually. Support static ...
Color Extractor
Extract colors from images online. Get dominant colors and c...
Code Analyzer
Analyze code quality online. Check for errors, warnings, and...
Code Formatter
Format and beautify code online. Support multiple languages ...
JavaScript Formatter
Format and beautify JavaScript code online. Improve code rea...
cURL Converter
Convert cURL commands to Python, JavaScript, PHP, Go, and mo...
Cron Expression Generator
Generate and validate Cron expressions online. Convert Cron ...
Timestamp Batch Converter
Convert multiple timestamps at once. Batch process Unix time...
API Tester
Test HTTP APIs online with support for GET, POST, PUT, DELET...
HTTP Header Analyzer
Analyze HTTP response headers. Check security headers, CORS ...