There are 3 built-in file descriptors: stdin, stdout and stderr (std=standard).
Basic
0/1/2 references stdin/stdout/stderr
>/2> redirects stdout/stderr, where > is taken as 1>
&1/&2 references stdout/stderr
&> redirects everything
> creates or overwrites a file
>> creates or appends to a file
< reads from a file, where < is taken as 0<
Note: You should be pretty sure of what a command is doing if you are going to wipe it's output.
Redirecting Examples
stdout to file: ls -l > ls-l.txt
stderr to file: grep da * 2> grep-errors.txt
one to another: grep da * 1>&2
everything: do_stuff &> /dev/null
combined: command < input-file > output-file, reads from input-file and writes stdout to output-file
- 0 istifadəçi bunu faydalı hesab edir
Uyğun məqalələr
Using Index Manager
This tutorial will teach about using the Index Manager. The Index Manager allows you to customize...
Mod PageSpeed
You can install Mod PageSpeed by using following stepswget...
How To Set Up A Cron Job via CPanel
This tutorial is going to show you how to setup a cron job in cPanel the easy way. You can set a...
How do I configure a cron job ?
Cron jobs are commands used to schedule tasks that must run periodically, for instance: from...
