Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Convert Windows text file to UNIX format without dos2unix
Answer:
As explained in this post, conversion using dos2unix is needed to convert file edited from Windows platform.
However, a simple command also can do the same job
# cat input.pl | col -b > output.pl
Wait for a process terminated
Answer:
wait command allow you to monitor the termination of a process and quit afterward.
It is very useful when you want to trigger some action when a particular process terminated.
E.g. Send an email when a long running process of PID 5870 terminated
# wait 5870 && echo Finished | mail -s Task [email protected]
Print current environment variables
Answer:
You can use the env command.
E.g.
# env
TERM=xterm
SHELL=/bin/bash
XDG_SESSION_COOKIE=ff8f5b056d8812b8bd9ecadc4b1...
...
Check the exit status of a command
Answer:
You can check the exit status of a command by checking the special variable $?
E.g.
# ls
# echo $?
0
# foo
-bash: foo: command not found
# echo $?
127
Non zero (e.g. 127) exit status mean the command failed to execute.
Display current system hardware architecture
Answer:
arch can display the current system hardware architecture name (same as uname -m)
# arch
x86_64
