【shell 】syntax error in conditional expression

2019年7月25日 355次阅读

编写shell 脚本时遇见 syntax error in conditional expression 错误，

#!/bin/bash

# cleanup /var/log/message

LOG_DIR=/var/log

ROOT_DID=0

LINES=50

E_XCD=66

E_NOTROOT=67

if [[ “$UID” -ne “$ROOT_UID”]]

then

 echo “Must be root to run this script.”

 exit $E_NOTROOT

fi

if [ -n “$1”]

then

    lines=$1

else

   lines=$LINES

fi

…….

root@client.example.com # sh test.sh

test.sh: line 12: syntax error in conditional expression

test.sh: line 13: syntax error near `then’

test.sh: line 13: `then’

仔细查看是由于 if 条件中的中括号[ ]与变量之间必须有空格

root@client.example.com # vi test.sh

#!/bin/bash

# cleanup /var/log/message

LOG_DIR=/var/log

ROOT_DID=0

LINES=50

E_XCD=66

E_NOTROOT=67

if [[ “$UID” -ne “$ROOT_UID” ]]

then

 echo “Must be root to run this script.”

 exit $E_NOTROOT

fi

if [ -n “$1”]

then

    lines=$1

else

   lines=$LINES

fi

…..

“test.sh” 60L, 793C written

修改以后，再次执行成功

root@client.example.com # sh test.sh 20

Logs cleaned up 

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