标签：shell脚本参数传递 shift命令 getopts命令
[本文是自己学习所做笔记，欢迎转载，但请注明出处：http://blog.csdn.net/jesson20121020]
今天再来看一下如何向shell脚本传递参数，需要掌握两个命令，一个是 shift命令，另一个是getopts。
用法：
shift n 每次将参数位置向左偏移n位
假如我们要实现统计多个文件的总行数，就可以用到这个shift命令了，如下:
opt2.sh
#!/bin/bash
#op2 static files total lines;
staticlines(){
echo "static:`basename $0` filenames"
exit
}
totalline=0
if [ $# -lt 2 ]
then
staticlines
fi
while [ $# -ne 0 ]
do
line=`cat $1 | wc -l`
echo "$1:${line}"
totalline=$[ $totalline+$line ]
shift
done
echo "-------------------------------------"
echo "totalline:${totalline}"
给予可执行权限，执行：
jesson@jesson-K43SV:~/develop/worksapce/shell_workspace$ chmod a+rx opt2.sh jesson@jesson-K43SV:~/develop/worksapce/shell_workspace$ ./opt2.sh static:opt2.sh filenames jesson@jesson-K43SV:~/develop/worksapce/shell_workspace$ ./opt2.sh lsout.txt static:opt2.sh filenames jesson@jesson-K43SV:~/develop/worksapce/shell_workspace$ ./opt2.sh lsout.txt name.txt lsout.txt:18 name.txt:4 ------------------------------------- totalline:22 jesson@jesson-K43SV:~/develop/worksapce/shell_workspace$ ./opt2.sh lsout.txt name.txt while_test1.sh lsout.txt:18 name.txt:4 while_test1.sh:6 ------------------------------------- totalline:28通过shift 命令，我们可以很容易地实现统计log等信息。
该命令可以获得多个命令行参数。
还是一个脚本来分析getopts的用法
optsget.sh
#!/bin/bash
#optsget
ALL=false
HELP=false
FILE=false
VERBOSE=false
while getopts ahfvc: OPTION
do
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 $VERBOSE"
;;
c)
c=$OPTARG
echo "c valuse is $c"
;;
\?)
echo "`basename $0` -[a h f v] -[c value]"
;;
esac
done
给予可执行权限，执行结果如下：
jesson@jesson-K43SV:~/develop/worksapce/shell_workspace$ ./optsget.sh -a ALL is true jesson@jesson-K43SV:~/develop/worksapce/shell_workspace$ ./optsget.sh -a -f ALL is true FILE is true jesson@jesson-K43SV:~/develop/worksapce/shell_workspace$ ./optsget.sh -a -f -h ALL is true FILE is true HELP is true jesson@jesson-K43SV:~/develop/worksapce/shell_workspace$ ./optsget.sh -a -f -h -v ALL is true FILE is true HELP is true VERBOSE is true jesson@jesson-K43SV:~/develop/worksapce/shell_workspace$ ./optsget.sh -a -f -c ALL is true FILE is true ./optsget.sh: 选项需要一个参数 -- c optsget.sh -[a h f v] -[c value] jesson@jesson-K43SV:~/develop/worksapce/shell_workspace$ ./optsget.sh -a -f -c jesson ALL is true FILE is true c valuse is jesson不难看出，可以通过getopts命令取得多个参数，而且还可以为每个参数指定值，在需要指定值的参数后加：即可。
linux学习之shell脚本 ------- 脚本参数传递
标签：shell脚本参数传递 shift命令 getopts命令
原文地址：http://blog.csdn.net/jesson20121020/article/details/43375059
