To strike with a heavy, crushing blow: The thug bashed the hood of the car with a sledgehammer. if itself is a shell keyword, so you can find information about it with help if.if itself only branches based on whether the next command returns true ( 0 ) or false ( not zero ). 2. 6.4 Bash Conditional Expressions. The test and [commands determine their behavior based on the number of arguments; see the descriptions of those commands for any other command-specific actions.. Here, The condition in the if statement often involves a numerical or string test comparison, but it can also be any command that returns a status of 0 when it succeeds and some nonzero status when it fails. Syntax of Bash Else IF – elif. Primary Meaning [ -a FILE] True if FILE exists. It is widely available on various operating systems and is a default command interpreter on most GNU/Linux systems. In bash the options and behaviors are defined by bash. Learn more. The name Bash is an acronym for Bourne-Again SHell, a pun on the name Stephen Bourne, creator of one of Bash's predecessors. Expressions may be unary or binary, and are formed from the following primaries. The name is an acronym for the ‘Bourne-Again SHell’. It is also kind of a synonym for test. [ -e FILE] True if FILE exists. ; The statements that follow the then statement can be any valid UNIX command, any executable user program, any executable shell script, or any shell statement with the exception of fi. [ -g FILE] True if FILE exists and its SGID bit is set. 1. The first beta was released in 1989, and, as of this writing, has seen its most recent update in December 2020: version 5.1. They otherwise work the same, [ -e foo ] is equivalent to test -e foo. Conditional expressions are used by the [[compound command and the test and [builtin commands. What does bash mean? [ -d FILE] True if FILE exists and is a directory. Bash Else If. Learn more. | Meaning, pronunciation, translations and examples [ -c FILE] True if FILE exists and is a character-special file. In bash you can do help test to see all the options it supports. In Bash else-if, there can be multiple elif blocks with a boolean expression for each of them. Following is the syntax of Else If statement in Bash Shell Scripting. of a compound command OR function name { ## ksh style works in bash command1 command2 } OR function name() { ## bash-only hybrid command1 command2 } One Line Functions Syntax. The only real difference between [and test should be that [requires a ] after your arguments, whereas test does not. To bash is to hit very hard or to say unkind things about someone or something. Bash up definition: If someone bashes you up , they attack you violently and injure you. 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