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What does $# mean in shell? - Unix Linux Stack Exchange What does $# mean in shell? I have code such as if [ $# -eq 0 ] then I want to understand what $# means, but Google search is very bad for searching these kinds of things
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
Meaning of $? (dollar question mark) in shell scripts What does echo $? mean in shell programming?true echo $? # echoes 0 false echo $? # echoes 1 From the manual: (acessible by calling man bash in your shell) ? Expands to the exit status of the most recently executed foreground pipeline By convention an exit status of 0 means success, and non-zero return status means failure Learn more about exit statuses on wikipedia There are other special
What is the difference between $@ and $* in shell scripts? In shell scripts, what is the difference between $@ and $*? Which one is the preferred way to get the script arguments? Are there differences between the different shell interpreters about this?
What do $? $0 $1 $2 mean in a shell script? - Stack Overflow I often come across $?, $0, $1, $2, etc in shell scripting I know that $? returns the exit status of the last command: echo quot;this will return 0 quot; echo $? But what do the others do? What
bash - What does lt; lt; lt; mean? - Unix Linux Stack Exchange it seems < is for passing file (or directory), << @ for passing multiple lines (similar to the banner command in cisco switches; as terminated by a custom string @ in this case), and <<< to pass a string (instead of file) test them yourself with cat and you'll grasp it very quickly