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Difference between ${} and $() in a shell script - Super User $(command) is “command substitution” As you seem to understand, it runs the command, captures its output, and inserts that into the command line that contains the $(…); e g , $ ls -ld $(date +%B) txt -rwxr-xr-x 1 Noob Noob 867 Jul 2 11:09 July txt ${parameter} is “parameter substitution” A lot of information can be found in the shell’s man page, bash (1), under the “ Parameter
shell - What does -- (double dash double hyphen) mean? - Unix . . . More precisely, a double dash (--) is used in most Bash built-in commands and many other commands to signify the end of command options, after which only positional ("non-option") arguments are accepted Example use: Let's say you want to grep a file for the string -v Normally -v will be considered the option to reverse the matching meaning (only show lines that do not match), but with -- you
How to if else statement in shell script - Stack Overflow The if statement in shell uses the command [ Since [ is a command (you could also use 'test'), it requires a space before writing the condition to test To see the list of conditions, type: man test You'll see in the man page that: s1 > s2 tests if string s1 is after string s2 n1 gt n2 tests if integer n1 is greater than n2 In your case, using > would work, because string 100 comes after
What is the purpose of in a shell command? - Stack Overflow 180 command-line - what is the purpose of ? In shell, when you see $ command one command two the intent is to execute the command that follows the only if the first command is successful This is idiomatic of Posix shells, and not only found in Bash It intends to prevent the running of the second process if the first fails