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bash - Shell equality operators (=, ==, -eq) - Stack Overflow It depends on the Test Construct around the operator Your options are double parentheses, double brackets, single brackets, or test If you use ((…)), you are testing arithmetic equality with == as in C: $ (( 1==1 )); echo $? 0 $ (( 1==2 )); echo $? 1 (Note: 0 means true in the Unix sense and a failed test results in a non-zero number ) Using -eq inside of double parentheses is a syntax
An and operator for an if statement in Bash - Stack Overflow Modern shells such as Bash and Zsh have inherited this construct from Ksh, but it is not part of the POSIX specification If you're in an environment where you have to be strictly POSIX compliant, stay away from it; otherwise, it's basically down to personal preference
What do the -n and -a options do in a bash if statement? What are primaries? I call them "switches", but the bash documentation that you linked to refers to the same thing as "primaries" (probably because this is a common term used when discussing parts of a boolean expression) Background and docs In sh scripts if is a command that takes a command as its argument, executes it and tests its return code
Which characters need to be escaped when using Bash? Is there any comprehensive list of characters that need to be escaped in Bash? Can it be checked just with sed? In particular, I was checking whether % needs to be escaped or not I tried echo "h
What is the difference between single and double square brackets in Bash? Ubuntu 16 04 actually has an executable for it at usr bin [ provided by coreutils, but the bash built-in version takes precedence Nothing is altered in the way that Bash parses the command In particular, < is redirection, and || concatenate multiple commands, ( ) generates subshells unless escaped by \, and word expansion happens as usual
Bash Script : what does #! bin bash mean? - Stack Overflow 21 In bash script, what does #! bin bash at the 1st line mean ? In Linux system, we have shell which interprets our UNIX commands Now there are a number of shell in Unix system Among them, there is a shell called bash which is very very common Linux and it has a long history This is a by default shell in Linux
How do I write a for loop in Bash? - Stack Overflow The Bash for consists of a variable (the iterator) and a list of words over which the iterator will, well, iterate So, if you have a limited list of words, just put them in the following syntax: