Shell Programming Basics Tutorial 7--script parameter delivery

7. Passing of script parameters
7.1.shift command
Brief introduction:
Shift n Shifts the parameter position to the left n bits at a time
Example

#!/bin/bashusage () {    echo "usage: ' basename ' filenames"}totalline=0# The following statement $# the number of arguments if [$#-lt 2]then    usagefiwhile [$#-ne 0]do    line= ' cat $ | wc-l ' echo ' $1:${line} ' totalline=$ [$totalline + $line]shiftdoneecho '----- ----"echo" Total:${totalline} "

7.2.getopts
Brief introduction:
Get multiple command-line arguments
Example

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

7.3.shift and getopts can be passed with more than 9 parameters

Shell Programming Basics Tutorial 7--script parameter delivery