some linux commands

LinuxCmds.md

Linux Commands

Change text to uppercase

$tr a-z A-Z < input.txt

Redirect stdout/stderr to file

stdout to file

$cat input.txt  > /dev/null

stderr to file

$cat input.txt  2> /dev/null

both stdout and stderr to file

$cat input.txt > /dev/null 2>&1

check running processes by a specific user

$top -u <UserName>

show active users on the system

$w

check current user name

$whoami

Resume rsync on an interrupted transfer

The remote directory should be the absolute path, not a soft link.

$rsync -avzP local-dir remote-dir

Write a message to another user on the same linux machine

check user

$who
user1    pts/0        2007-03-10 02:21 (:0.0)

Write message, hit enter to send, ctrl+D to quit

$write user1 pts/0

tar and untar files

tar files and directories

$tar -cvzf  <xxx>.tgz  folders/  file1 file2 ....

untar compressed file

$tar -xvzf  <xxx>.tgz