为什么我会遇到“意外操作员"?我在 Bash 中的条件错误? [英] Why do I get an "unexpected operator" error for my condition in Bash?
问题描述
我得到了监控 apache 的代码.该文件的名称是 test.sh
.我稍微更改了代码.
I got the code for monitoring apache. The name of the file is test.sh
. I changed the code a bit.
我正在寻找的是,当我这样做时:
What I was looking for is, when I do:
./test.sh -H localhost -wr 2 -cr 5 -arg cpu_load
它应该测试 apache 的 cpu_load
,即,我试图用我的 -arg
参数控制监控 apache,但这似乎不起作用.
It should test apache for its cpu_load
, i.e., I tried to control monitoring apache with my -arg
parameter, but that doesn't seem to be working.
当我运行这个时:
./test.sh -H localhost -wr 2 -cr 5 -arg cpu_load
我收到错误:
./test.sh: 282: [: -ge: unexpected operator
./test.sh: 286: [: -ge: unexpected operator
这是部分代码:
#!/bin/sh
while test -n "$1"; do
case "$1" in
--help|-h)
print_help
exit $ST_UK
;;
--version|-v)
print_version $PROGNAME $VERSION
exit $ST_UK
;;
--hostname|-H)
hostname=$2
shift
;;
--port|-P)
port=$2
shift
;;
--timeout|-t)
timeout=$2
shift
;;
--remote-server|-R)
remote_srv=1
;;
--binary_path|-b)
path_binary=$2
shift
;;
--pid_path|-p)
path_pid=$2
shift
;;
--pid_name|-n)
name_pid=$2
shift
;;
--status-page|-s)
status_page=$2
shift
;;
--secure|-S)
secure=1
;;
--warning-req|-wr)
warn_req=$2
shift
;;
--critical-req|-cr)
crit_req=$2
shift
;;
--userargument|-arg)
user_arg=$3
shift
;;
*)
echo "Unknown argument: $1"
print_help
exit $ST_UK
;;
esac
shift
done
#other codes
if [ ${wclvls_req} = 1 ]
then
if [ ${user_arg} -ge ${warn_req} -a ${user_arg} -lt ${crit_req} ]
then
echo "WARNING - ${output} | ${perfdata}"
exit $ST_WR
elif [ ${user_arg} -ge ${crit_req} ]
then
echo "CRITICAL - ${output} | ${perfdata}"
exit $ST_CR
else
echo "OK - ${output} | ${perfdata}"
exit $ST_OK
fi
else
echo "OK - ${output} | ${perfdata}"
exit $ST_OK
fi
fi
我哪里出错了?
推荐答案
if
user_arg、warn_req
等)> 条件可能为空.
One of your variables ( user_arg
, warn_req
etc ) in the if
condition might be empty.
更好的写法是将变量引用为(如果您想作为整数进行比较,在您的情况下可能会失败):
Better way to write that is with quoting the variables as (which may fail in your case if you want to compare as integers):
if [ "${user_arg}" -ge "${warn_req}" -a "${user_arg}" -lt "${crit_req}" ]
或者另一种方法是指定默认值,这样如果变量为空或未定义,则不会失败,如下所示.
Or another way is to specify the default values so that if variable is null or undefined if won't fail as below.
if [ ${user_arg:-0} -ge ${warn_req:-0} -a ${user_arg:-0} -lt ${crit_req:-0} ]
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