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2010/11/25 -For string equality comparison, use: if [[ "$s1" == "$s2" ]]. For string does NOT equal comparison, use: if [[ "$s1" != "$s2" ]].
2026/10/21 -Comparing strings is one of the most fundamental operations in Bash scripting. Use == and != for equality checks, =~ for regex matching, and -z ...
2014/7/17 --eq is an arithmetic operator, which compares two numbers. Use = (portable/standard sh ), =~ or == instead.
2023/3/13 -You can write an 'if' statement on a single line if you add ; : if [[ "str1" == "str2" ]]; then compare=true; else compare=false; fi.
2026/1/13 -Summary · Multiple Methods: You can compare strings using the test command, single brackets [ ] , double brackets [[ ]] , or one-liner logic.
How to compare strings in Bash Bash Compare Strings: How to Check if Two Strings Are Equal Compare a string using sh shell - Stack Overflow ...
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2013/9/30 -The right way to compare those two strings ( S1 and S2 ) using if is: if [ "$S1" = "$S2" ]. Do not be stingy in use spaces in this case.
2020/2/15 -Compare strings in Bash with =, ==, !=, -z and -n. Learn empty vs unset values, substring and glob matching, case-insensitive checks, ...
2025/8/3 -The script below removes any . characters and adds 0 characters to the strings before comparing. Some examples are given in the table below.
Compare strings in Bash with the = , != and =~ operators, plus how to test for empty strings and substrings inside conditionals.