How do you pass a parameter to a function in bash?
To pass any number of arguments to the bash function simply put them right after the function’s name, separated by a space. It is a good practice to double-quote the arguments to avoid the misparsing of an argument with spaces in it. The passed parameters are $1 , $2 , $3 …
Can bash functions take arguments?
Instead, Bash functions work like shell commands and expect arguments to be passed to them in the same way one might pass an option to a shell command (e.g. ls -l ). In effect, function arguments in Bash are treated as positional parameters ( $1, $2.. $9, ${10}, ${11} , and so on).
How do I pass a parameter in Linux script?
Arguments can be passed to the script when it is executed, by writing them as a space-delimited list following the script file name. Inside the script, the $1 variable references the first argument in the command line, $2 the second argument and so forth. The variable $0 references to the current script.
Can bash functions return values?
Bash functions, unlike functions in most programming languages do not allow you to return a value to the caller. To return values, you can set a global variable with the result, or use command substitution, or you can pass in the name of a variable to use as the result variable. …
Where are bash functions stored?
Typically bash functions are permanently stored in a bash start-up script.
- System-wide start-up scripts: /etc/profile for login shells, and /etc/bashrc for interactive shells.
- User define start-up scripts: ~/.
- More information on interactive/login shells can be found in the bash man page in the INVOCATION section.
What is read command?
read command in Linux system is used to read from a file descriptor. Basically, this command read up the total number of bytes from the specified file descriptor into the buffer. But on success, it returns the number of bytes read. Zero indicates the end of the file.