分类: 嵌入式
2013-02-22 17:54:20
#!/bin/bash if [ $# -lt 1 ]; then echo "error.. need args" exit 1 fi echo "commond is $0" echo "args are:" for arg in "$@" do echo $arg done |
[admin@intlqa142055x ~]$ type getopt getopt is /usr/bin/getopt [admin@intlqa142055x ~]$ type getopts getopts is a shell builtin |
echo $* while getopts ":a:bc" opt do case $opt in a ) echo $OPTARG echo $OPTIND;; b ) echo "b $OPTIND";; c ) echo "c $OPTIND";; ? ) echo "error" exit 1;; esac done echo $OPTIND shift $(($OPTIND - 1)) #通过shift $(($OPTIND - 1))的处理,$*中就只保留了除去选项内容的参数,可以在其后进行正常的shell编程处理了。 echo $0 echo $* |
#!/bin/bash # A small example program for using the new getopt(1) program. # This program will only work with bash(1) # An similar program using the tcsh(1) script. language can be found # as parse.tcsh # Example input and output (from the bash prompt): # ./parse.bash -a par1 'another arg' --c-long 'wow!*\?' -cmore -b " very long " # Option a # Option c, no argument # Option c, argument `more' # Option b, argument ` very long ' # Remaining arguments: # --> `par1' # --> `another arg' # --> `wow!*\?' # Note that we use `"$@"' to let each command-line parameter expand to a # separate word. The quotes around `$@' are essential! # We need TEMP as the `eval set --' would nuke the return value of getopt. #-o表示短选项,两个冒号表示该选项有一个可选参数,可选参数必须紧贴选项 #如-carg 而不能是-c arg #--long表示长选项 #"$@"在上面解释过 # -n:出错时的信息 # -- :举一个例子比较好理解: #我们要创建一个名字为 "-f"的目录你会怎么办? # mkdir -f #不成功,因为-f会被mkdir当作选项来解析,这时就可以使用 # mkdir -- -f 这样-f就不会被作为选项。 TEMP=`getopt -o ab:c:: --long a-long,b-long:,c-long:: \ -n 'example.bash' -- "$@"` if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi # Note the quotes around `$TEMP': they are essential! #set 会重新排列参数的顺序,也就是改变$1,$2...$n的值,这些值在getopt中重新排列过了 eval set -- "$TEMP" #经过getopt的处理,下面处理具体选项。 while true ; do case "$1" in -a|--a-long) echo "Option a" ; shift ;; -b|--b-long) echo "Option b, argument \`$2'" ; shift 2 ;; -c|--c-long) # c has an optional argument. As we are in quoted mode, # an empty parameter will be generated if its optional # argument is not found. case "$2" in "") echo "Option c, no argument"; shift 2 ;; *) echo "Option c, argument \`$2'" ; shift 2 ;; esac ;; --) shift ; break ;; *) echo "Internal error!" ; exit 1 ;; esac done echo "Remaining arguments:" for arg do echo '--> '"\`$arg'" ; done |