The shell script for Linux learning-------script parameter passing

[This is my own study notes, welcome reprint, but please specify the source:http://blog.csdn.net/jesson20121020]

see how to pass parameters to a shell script today, you need to master two commands, one is the shift command, the other is getopts.

Script parameter Passingshift Command

Usage:

Shift n Shifts the parameter position to the left n bits at a time

If we want to implement the statistics of the total number of files, we can use this shift command, as follows:

opt2.sh

#!/bin/bash#op2  static files Total Lines;staticlines () {   echo "static: ' basename ' filenames"   exit} totalline=0if [$#-lt 2]then    staticlinesfiwhile [$#-ne 0]do    line= ' cat $ | wc-l '    echo ' $1:${line} '    t otalline=$[$totalline + $line]    shiftdoneecho "-------------------------------------" echo "totalline:${ Totalline} "

Give executable permission to execute:

[Email protected]:~/develop/worksapce/shell_workspace$ chmod a+rx opt2.sh [email protected]:~/develop/worksapce/ shell_workspace$./opt2.sh static:opt2.sh filenames[email protected]:~/develop/worksapce/shell_workspace$./opt2.sh lsout.txtstatic:opt2.sh filenames[email protected]:~/develop/worksapce/shell_workspace$./opt2.sh lsout.txt Name.txt lsout.txt:18name.txt:4-------------------------------------Totalline:22[email protected]:~/develop/ worksapce/shell_workspace$./opt2.sh lsout.txt name.txt while_test1.sh lsout.txt:18name.txt:4while_test1.sh:6------ -------------------------------totalline:28

With the shift command, we can easily implement information such as statistics log.

getopts Command

The command can obtain multiple command-line arguments.

or a script to analyze the use of getopts

optsget.sh

#!/bin/bash#optsgetall=falsehelp=falsefile=falseverbose=falsewhile getopts Ahfvc:optiondo case $OPTION in     A)         all=true         echo "All are $ALL"         ;;     h)         help=true         echo "Help is $HELP"         ;;     f)         File=true         echo "FILE is $FILE"         ;;     V)          verbose=true         echo "VERBOSE is $VERBOSE"         ;;     c)         c= $OPTARG         echo "C valuse is $c"         ;;     \?)         echo "' basename $-[a H F v]-[c value]"         ;;      Esacdone

Given executable permissions, the execution results are as follows:

[Email protected]:~/develop/worksapce/shell_workspace$./optsget.sh-aall is True[email protected]:~/develop/ worksapce/shell_workspace$./optsget.sh-a-fall is Truefile is True[email Protected]:~/develop/worksapce/shell_  workspace$./optsget.sh-a-f-hall is Truefile is Truehelp true[email ./optsget.sh-a-f-h-vall are Truefile is Truehelp trueverbose kspace$./optsget.sh-a-f-call is Truefile is true./optsget.sh: option requires one parameter--coptsget.sh-[a H F v]-[c Value][email Prot ected]:~/develop/worksapce/shell_workspace$./optsget.sh-a-f-c Jessonall is Truefile TRUEC

It is not difficult to see that multiple parameters can be obtained through the getopts command, and you can also specify a value for each parameter and add: If you need to specify a value.

Shell script for Linux learning-------script parameter passing