shell编译单引号时特殊处理

miaho

shell 在传递参数中带单引号时，会将' 转换成'\''。这样有的程序就会将'\''直接当作参数处理了，使程序出现错误。

./tt.sh "-a '/export/home/bin/lserver' -w 1:1 -c 1:1"
+ cmd=/usr/local/nagios/libexec/check_procs
+ params='-a '\''/export/home/pcs/bin/lserver'\'' -w 1:1 -c 1:1'
++ ./t1.sh -a ''\''/export/home/bin/lserver'\''' -w 1:1 -c 1:1
+ echo '$1:-a'
+ echo '$2:'\''/export/home/bin/lserver'\'''
+ echo '$3:-w'
+ echo '$4:1:1'
+ echo '$5:-c'
+ echo '$6:1:1'
+ result='$1:-a
$2:'\''/export/home/bin/lserver'\''
$3:-w
$4:1:1
$5:-c
$6:1:1'
+ echo '$1:-a' '$2:'\''/export/home/bin/lserver'\''' '$3:-w' '$4:1:1' '$5:-c' '$6:1:1'
$1:-a $2:'/export/home/bin/lserver' $3:-w $4:1:1 $5:-c $6:1:1


执行出错的程序
./tt.sh "-a '/sbin/mingetty tty3' -w 1:1 -c 1:1"
+ cmd=/usr/local/nagios/libexec/check_procs
+ params='-a '\''/sbin/mingetty tty3'\'' -w 1:1 -c 1:1'
++ /usr/local/nagios/libexec/check_procs -a ''\''/sbin/mingetty' 'tty3'\''' -w 1:1 -c 1:1
+ result='PROCS CRITICAL: 0 processes with args '\'''\''/sbin/mingetty'\'', STATE = tty3'\'''
+ echo PROCS CRITICAL: 0 processes with args ''\'''\''/sbin/mingetty'\'',' STATE = 'tty3'\'''
PROCS CRITICAL: 0 processes with args ''/sbin/mingetty', STATE = tty3'

rdcwayx

贴出源文件

miaho

#########tt.sh

#!/bin/bash
set -x
cmd=/usr/local/nagios/libexec/check_procs
params=$1
result=$($cmd $params)
echo $result


#########tt.sh--另外一个,做测试对比的

#!/bin/bash
set -x
cmd=/usr/local/nagios/libexec/check_procs
params=$1
result=$(./t1.sh $params)
echo $result


###########t1.sh
#!/bin/bash
set -x
echo \$1:"$1"
echo \$2:"$2"
echo \$3:"$3"
echo \$4:"$4"
echo \$5:"$5"
echo \$6:"$6"

waker

params=$@
result="$($cmd $params)"
echo "$result"

miaho

waker 发表于 2012-05-21 11:35
params=$@
result="$($cmd $params)"
echo "$result"

我尝试了一下，还是一样的。