Use the Linux find command with caution

Use the Linux find command with caution

When using the find command in Linux, use the-OK option to avoid accidental deletion of files. This option will request your permission before removing any files.

Recently, a friend reminded me of a useful option to run it more cautiously.findCommand, which is-ok. In addition to an important difference, it works in a way similar-execSimilarfindCommand to request permissions before executing the specified operation.

Here is an example. If you usefindCommand to find and delete files. You may use the following command:

1. $ find.-name runme -execrm{} \;

Any files named "runme" in the current directory and Its subdirectories will be immediately deleted-of course, you must have the permission to delete them. Switch-okOption, you will see something like this,findThe command will request the permission before deleting the file. AnsweryIndicates that "yes" will allowfindCommand to continue and delete files one by one.

1. $ find.-name runme -ok rm{} \;
2. <rm..../bin/runme >?

 

-Execdir command is also an option

Another one can be used to modifyfindWhich of the following options can make command behavior more controllable?-execdir.-execWill run any specified command, and-Execdir: run the specified command from the directory where the file is located, instead of runningFind 'command directory to run the specified command. Here are two examples:

1. $ pwd
2. /home/shs
3. $ find.-name runme -execdir pwd \;
4. /home/shs/bin

1. $ find.-name runme -execdir ls \;
2. lsrm runme

So far it has been quite good. But remember,-execdirThe command is also executed in the directory of the matching file. If you run the following command and the directory contains a file named "ls ",NoExecute Permission, it will also run the file. Use-execOr-execdirSimilarsourceTo run the command.

1. $ find.-name runme -execdir ls \;
2. Running the /home/shs/bin/lsfile

1. $ find.-name runme -execdir rm{} \;
2. Thisis an imposter rm command

1. $ ls-l bin
2. total 12
3. -r-x------1 shs shs 25Oct1318:12ls
4. -rwxr-x---1 shs shs 36Oct1318:29rm
5. -rw-rw-r--1 shs shs 28Oct1318:55 runme

1. $ cat bin/ls
2. echoRunning the $0 file
3. $ cat bin/rm
4. echoThisis an imposter rm command

 

-The okdir option also requests permissions.

Be more cautious and use-okdir. Similar-ok.

1. $ find.-name runme -okdir rm{} \;
2. <rm..../bin/runme >?

You can also specify the full path of the command you want to use with caution to avoid any problems with fake commands like above.

1. $ find.-name runme -execdir /bin/rm{} \;

findIn addition to printing by default, the command also has many options, some of which can make your file search more accurate, but it is always good to be cautious.

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