unary operator expected

问题：

1．unary operator expected

[root@foundation0 hrr]# ./r3

./r3: line 29: [:/var/log: unary operator expected

Logs cleaned up.

第29行如下：

29 if [ `pwd` !="$LOG_DIR" ]

改成

if [ "$PWD" !="$LOG_DIR" ]

就好了

[root@foundation0 hrr]# cat r3

#!/bin/bash

LOG_DIR=/var/log

ROOT_UID=0

LINES=10

E_XCD=66

E_NOTROOT=67

if [ "$UID" -ne"$ROOT_UID" ]

then

echo "Must be root to run this script."

exit $E_NOTROOT

if [ -n "$1" ] #n是非空的意思

then

lines=$1

else

lines=$LINES

#E_WRONGARGS=65

#case "$1" in

#"")lines=50;;

#*[!0-9]*)echo "Usage:`basename $0`file-to-cleanup";

# exit $E_WRONGARGS;;

#*)lines=$1;;

#esac

cd $LOG_DIR

#if [ "`pwd`"!="$LOG_DIR" ]

if [ "$PWD" !="$LOG_DIR" ]

#如果是在[]里，最好用$加大写命令

then

echo "Can't change to $LOG_DIR."

exit $E_XCD

#cd /var/log ||{

# echo "Cannot change to nessary directory.">&2

# exit $E_XCD;

tail -$lines messages > mesg.temp

cat /dev/null > messages

cat /dev/null > wtmp

echo "Logs cleaned up."

mv mesg.temp messages

exit 0

[root@foundation0 hrr]#

转载：http://blog.csdn.net/goodlixueyong/article/details/6564591

本文转自810105851 51CTO博客，原文链接：http://blog.51cto.com/4708948/1712970，如需转载请自行联系原作者

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