Linux environment variable Modification

 

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(For example, add/sbin to the path environment variable)

(1) If you only want to add temporary modifications during the current Boot Process, the next boot will be invalid, you can:

Enter export Path = $ path:/sbin

(2) If only the current user is permanently added:

In ~ /.In bash_profile, a line similar to this path = $ path: $ home/bin is added near the end, and then it becomes Path = $ path: $ home/bin:/sbin.

Run source ~ /. Bash_profile command to make the modification take effect immediately

(3) If all users in the system are permanently added:

Add export Path = $ path:/sbin at the end of the/etc/profile file

After the file is modified and maintained, run the source/etc/profile command to make the modification take effect immediately.

 

 

In fact, the source/etc/profile command takes effect immediately in the current shell. If a new shell is opened, the $ path of the new shell is not added to the new path. Only after restart.

/Etc/profile:

 

For I in/etc/profile. d/*. Sh; do

If [-R "$ I"]; then

. $ I

Fi

Done

Echo Path = $ path:/sbin --- add this

Unset I

Unset pathmunge

 

 

PS:

Test in RedHat as4 environment.