shell程序的应用

忽然之间ch · **发表于 :** 2016-12-30 11:43

我想编写一个shell程序来检测位置参数个数，下面是我的程序。
$cat ex2
#bin/bash
#if no arguments, then listing the current directory
#otherwise,listing each subdirectory
if test $#=0
then ls
else
for i
do
ls -l $i|grep '∧d'
done
执行的结果不正确，请大神指教 :Cry

vickycq · **发表于 :** 2016-12-30 12:49

代码:

#!/bin/bash
#if no arguments, then listing the current directory
#otherwise,listing each subdirectory
if test $# = 0; then
    ls
else
    for i in ./*; do
        if test -d ${i}; then
            ls -l $i
        fi
    done
fi

代码:

#!/bin/bash
#if no arguments, then listing the current directory
#otherwise,listing each subdirectory
if test $# = 0; then
    ls
else
    for i in ./*; do
        if test -d ${i}; then
            ls -ld $i
        fi
    done
fi

代码:

#!/bin/bash
#if no arguments, then listing the current directory
#otherwise,listing each subdirectory
if test $# = 0; then
    ls
else
    ls -l | grep ^d
fi

代码:

#!/bin/bash
#if no arguments, then listing the current directory
#otherwise,listing each subdirectory
if test $# = 0; then
    ls
else
    ls -l */
fi

代码:

#!/bin/bash
#if no arguments, then listing the current directory
#otherwise,listing each subdirectory
if test $# = 0; then
    ls
else
    ls -ld */
fi

参考
http://unix.stackexchange.com/questions/86722/how-do-i-loop-through-only-directories-in-bash
http://stackoverflow.com/questions/14352290/listing-only-directories-using-ls-in-bash-an-examination

shell程序的应用

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