bash变量的如果然后语句不正确地计算

Question

我写了一个脚本，应该告诉我夜间网络备份的行数。它应该是109，如果它是相同的，我会收到成功的电子邮件，如果不一样，我会收到一封失败的电子邮件。我已将2个虚假主机添加到下面的脚本中检查的文件之一，以查看它是否会失败。 if then语句根本不起作用。如果我在文件'确认备份'和'备份'中的主机数量不同，它就没有区别，只要使用第一个if语句，无论它们是否不同。

最后你可以看到我在两个文件上运行了wc -l，但它们不同，但脚本运行并给了我第一个if，then：备份和确认备份匹配。它也以另一种方式 - 如果它们是相同的，我只是得到第一个如果然后声明 - 起初让我觉得它工作，直到我检查与数量不匹配的文件。

#!/bin/bash 

# Variables 
date=`date +%Y%m%d` 
o1=$(cat /netops/backups/scripts/hostfiles/backed-up | wc -l) 
o2=$(cat /netops/backups/scripts/hostfiles/confirm-backed-up | wc -l) 
sdir=/netops/backups/storage/ 
hostdir=/netops/backups/scripts/hostfiles 

＃功能

function confirm_backup 
{ 
find $sdir -type f -mtime 0 -printf '%f\n' |grep $date >$hostdir/backed-up 
cat $hostdir/cisco-nexus.txt >> $hostdir/confirm-backed-up 
cat $hostdir/cisco-firewall.txt >> $hostdir/confirm-backed-up 
cat $hostdir/esx.txt >> $hostdir/confirm-backed-up 
cat $hostdir/f5.txt >> $hostdir/confirm-backed-up 
cat $hostdir/fortigate.txt >> $hostdir/confirm-backed-up 
cat $hostdir/rsa.txt >> $hostdir/confirm-backed-up 
cat $hostdir/sw-no-pk.txt >> $hostdir/confirm-backed-up 
cat $hostdir/switch-router.txt >> $hostdir/confirm-backed-up 
cat $hostdir/tlite.txt >> $hostdir/confirm-backed-up 
} 

# Verify Backup 

function backup_verify 
{ 
if [ "echo $o1" == "echo $o2" ]; then # I tried this with if [ "$o1" == "$o2"] also & if (($o1 != $o2)) & [ "$o1" = "o2" ] - all same results. 
echo "backed-up and confirm-backed-up match" & mail -s "All Backups succeeded" 12345566@blah.net < /dev/null 
else 
echo "a backup has failed" & mail -s "A backup failed" 123456789@vtext.com < /dev/null 
fi 
} 

# Start Script Run 

confirm_backup 
backup_verify 
cat /dev/null > $hostdir/confirm-backed-up # this is here for long term - i tested it with this gone so otherwise obviously my wc -l would have been 0 
cat /dev/null > $hostdir/backed-up 

user@host:/netops/backups/scripts$ ./test6.sh 
backed-up and confirm-backed-up match 
Null message body; hope that's ok # WRONG! 
user@host:/netops/backups/scripts$ cd hostfiles/ 
user@host:/netops/backups/scripts/hostfiles$ wc -l backed-up 
109 backed-up # so I check manually 
user@host:/netops/backups/scripts/hostfiles$ wc -l confirm-backed-up 
111 confirm-backed-up # the files are different. 

Answer 1

我相信你应该设置你的变量后您填写您的文件backed-up和confirm-backed-up。否则，文件中的行数为空，if条件为真（0 = 0）。

因此，尝试改变这个：

# Start Script Run 

confirm_backup 
backup_verify 
cat /dev/null > $hostdir/confirm-backed-up # this is here for long term - i tested it with this gone so otherwise obviously my wc -l would have been 0 
cat /dev/null > $hostdir/backed-up 

要这样：

# Start Script Run 

confirm_backup 
o1=$(wc -l < /netops/backups/scripts/hostfiles/backed-up) 
o2=$(wc -l < /netops/backups/scripts/hostfiles/confirm-backed-up) 
backup_verify 
cat /dev/null > "$hostdir"/confirm-backed-up # this is here for long term - i tested it with this gone so otherwise obviously my wc -l would have been 0 
cat /dev/null > "$hostdir"/backed-up 

此外，对于数值比较，使用-eq和摆脱echo的：

if [ "$o1" -eq "$o2" ]; then 
    # do stuff 
fi 

。希望帮助。