Shell function function

1. Functions
Shell functions, which are used to customize a segment of a program. To simplify the code. Grammar:

Funtion fname () {    //do something}

The shell is top-down, executed from the left and right. So the definition of the function needs to precede the call. For example:

#!/bin/bash# author:yonggangfunction print_it () {    echo-n "Your choice is:"}case $ in    "one")        print_it; EC Ho $;;    " ") Print_it; echo $;;;    " Three ")        Print_it, Echo    $;;; *)        echo "Usage (One|two|three)"        ;; Esac

Perform:

[[Email protected] sh]$ sh func.sh twoyour choice is:two[[email protected] sh]$ sh func.sh oneyour Choice Is:one[[emai L Protected] sh]$

2. function parameter passing
function also has built-in variables, similar to shell script. $# parameter number of the first parameter, the second argument ... [email protected] All parameters see the following example:

#!/bin/bash# author:yonggangfunction Print_param () {    echo "paramter number:" $#    echo "First paramter:" $1
   
    echo "Second paramter:" $    echo "all paramter:" [email Protected]}print_param One and three
   

Run:

[[Email protected] sh]$ sh func.sh paramter number:  3first paramter:  onesecond paramter:  twoall paramter:  

Address: http://blog.csdn.net/yonggang7/article/details/40679111

Shell function function