This topic is about Linux Admin – tee Command.
tee is a simple command, letting an administrator write command output and view a file at the same time. This simple command can save time over first writing stdout to a file, then viewing the file contents.
Following are the common Switches used with tee.
| Command | Action |
|---|---|
| -a | Append to files instead of clobber file |
| -i | Ignore interrupts (for advanced use in scripting mostly) |
Without tee to both view and write files and directories in /etc, where each begins with the letter “a”.
[root@centosLocal Documents]# ls -d /etc/a* /etc/abrt /etc/aliases.db /etc/anacrontab /etc/at-spi2 /etc/autofs.conf /etc/auto.master.d /etc/auto.smb /etc/adjtime /etc/alsa /etc/asound.conf /etc/audisp /etc/autofs_ldap_auth.conf /etc/auto.misc /etc/avahi /etc/aliases /etc/alternatives /etc/at.deny /etc/audit /etc/auto.master /etc/auto.net [root@centosLocal Documents]# ls -d /etc/a* > ./etc_report_a.txt [root@centosLocal Documents]# cat ./etc_report_a.txt /etc/abrt /etc/adjtime /etc/aliases /etc/aliases.db /etc/alsa /etc/alternatives /etc/anacrontab /etc/asound.conf /etc/at.deny /etc/at-spi2 /etc/audisp /etc/audit /etc/autofs.conf /etc/autofs_ldap_auth.conf /etc/auto.master /etc/auto.master.d /etc/auto.misc /etc/auto.net /etc/auto.smb /etc/avahi [root@centosLocal Documents]#
This small task is much more efficient with the tee command.
[root@centosLocal Documents]# ls -d /etc/a* | tee ./etc_report_a.txt /etc/abrt /etc/adjtime /etc/aliases /etc/aliases.db /etc/alsa /etc/alternatives /etc/anacrontab /etc/asound.conf /etc/at.deny /etc/at-spi2 /etc/audisp /etc/audit /etc/autofs.conf /etc/autofs_ldap_auth.conf /etc/auto.master /etc/auto.master.d /etc/auto.misc /etc/auto.net /etc/auto.smb /etc/avahi [root@centosLocal Documents]#
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