A bug in the shell script that defines the PATH variable

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if define a PATH variable in a statement the path that raised the command bug where path change occurs problem

• Original script file: INotify +rsync Live Sharing

#!/bin/bash

path=/data/

ip=172.16.1.41

CD $PATH &&\ switch to a new variable.

/usr/bin/inotifywait-mrq--format '%w%f '-e create,moved_to,close_write,delete $PATH |while read line

Do

If [-f $line];then the rsync command at this time is no longer available (workaround absolute path)/usr/bin/rsync

Rsync-az $line--delete [email protected] $IP:: Nfsbackup--password-file=/etc/rsync.password

Else

CD $PATH &&\

Rsync-az./--delete [email protected] $IP:: Nfsbackup--password-file=/etc/rsync.piassword

Fi

Done

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• Sh-x the validation process

[Email protected] scripts]# vim jiankong2.sh

#cd $PATH &&\

Do

If [-F $line];then

echo 01 specifically adds the display content to the current variable path in a convenient location

Echo $PATH

echo 03

Rsync-az $line--delete [email protected] $IP:: Nfsbackup--

Password-file=/etc/rsync.password

Else

echo 01

Echo $PATH

Sh-x Viewing process

[Email protected] scripts]# sh-x jiankong2.sh

+ path=/data/

+ ip=172.16.1.41

+ Read Line

+/usr/bin/inotifywait-mrq--format%w%f-e create,moved_to

+ ' ['-f/data/oldgirl '] '

+ Echo 01

01

+ The path of the Echo/data/path variable is converted to/data/so the command reads the path

/data/

+ Echo 03

03

+ rsync-az/data/oldgirl--delete [email protected]:

Jiankong2.sh:line 13:rsync:command Not found conclusion: if the error command cannot be found

+ Read Line

+ ' ['-f/data/oldgirl '] '

+ Echo 01

01

+ echo/data/

/data/

+ Echo 03

03

+ rsync-az/data/oldgirl--delete [email protected]:

Jiankong2.sh:line 13:rsync:command not found the same command cannot be found

+ Read Line

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• Workaround One define the variable to and path Differentiate Open Delete CD to the variable path

[email protected] scripts]# cat jiankong2.sh

#!/bin/bash

weizhi=/data/

ip=172.16.1.41

#cd $PATH &&\

/usr/bin/inotifywait-mrq--format '%w%f '-e create,moved_to,close_write,delete $WEIZHI |while read line

Do

If [-F $line];then

Rsync-az $line--delete [email protected] $IP:: Nfsbackup--password-file=/etc/rsync.password

Else

#cd $PATH &&\

Rsync-az $WEIZHI--delete [email protected] $IP:: Nfsbackup--password-file=/etc/rsync.password

Fi

Done

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• Workaround Two

Use absolute paths to jump out of the current defined path environment

/usr/bin/rsync

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A bug in the shell script that defines the PATH variable