We can take a screenshot in UNIX/BSD/Linux systems with "scrot" program.
First, I will install it on my OpenBSD system. Let's define location where packages are, with PKG_PATH:
# export PKG_PATH=http://ftp.vim.org/OpenBSD/4.8/packages/i386
Checking program description and location with "pkg_info scrot":
# pkg_info scrot
Information for http://ftp.vim.org/OpenBSD/4.8/packages/i386/scrot-0.8p1.tgz
Comment:
commandline screen capture util
Description:
scrot is a commandline screen capture util like "import", but using
imlib2. It has lots of options for autogenerating filenames, and can
do fun stuff like taking screenshots of multiple displays and glueing
them together.
Maintainer: Victor Sahlstedt
WWW: http://www.linuxbrit.co.uk/scrot/
Ok. Now we will instal scrot with pkg_add:
# pkg_add -v scrot-0.8p1.tgz
scrot-0.8p1:imlib2-1.4.2p1: ok
scrot-0.8p1:giblib-1.2.4p4: ok
scrot-0.8p1: ok
#
That's fine. Please note that saved shots will be in working directory. In this case "/home/scrot":
#pwd
/home
# mkdir scrot
# cd scrot
# pwd
/home/scrot
So far, so good. Take note about naming convention :
# man scrot man: Formatting manual page...
scrot(1) scrot(1)
NAME
scrot - Screen capture using imlib2
SYNOPSIS
scrot [options] [file]
DESCRIPTION
scrot is a screen capture utility using the imlib2 library to aquire
and save images. scrot has a few options, detailed below. Specify
[file] as the filename to save the screenshot to. If [file] is not
specified, a date-stamped file will be dropped in the current direc-
tory.
Last check, are we in right directory ?
# pwd
/home/scrot
# ls
#
To get a screenshot of whole screen, we need just "scrot", without additional options. Default filetype is .png. Take note about timestamp.
# scrot
# ls
2013-01-04-152547_1024x768_scrot.png
#
If we need countdown option:
# scrot -d 5 -c
Taking shot in 5.. 4.. 3.. 2.. 1.. 0.
# ls
2013-01-04-152547_1024x768_scrot.png 2013-01-04-152940_1024x768_scrot.png
#
In case above, "-d" is for countdown, "5" is number of seconds, and "-c" is for showing countdown on screen.
You can define quality of screenshot in range scale up to 100. Default quality is 75. We will use "scrot -q 10", just to test it:
# scrot -q 10
# ls -lh
total 548
-rw-r--r-- 1 root wheel 94.2K Jan 4 15:25 2013-01-04-152547_1024x768_scrot.png
-rw-r--r-- 1 root wheel 95.5K Jan 4 15:29 2013-01-04-152940_1024x768_scrot.png
-rw-r--r-- 1 root wheel 81.1K Jan 4 15:32 2013-01-04-153221_1024x768_scrot.png
#
Pay attention to size of shot on 153221, it's smaller than 152940, of course.
How to change file type for screenshot ? For example, use "$t filename.jpg" :
# scrot $t desktop.jpg
# ls -lh
total 792
-rw-r--r-- 1 root wheel 94.2K Jan 4 15:25 2013-01-04-152547_1024x768_scrot.png
-rw-r--r-- 1 root wheel 95.5K Jan 4 15:29 2013-01-04-152940_1024x768_scrot.png
-rw-r--r-- 1 root wheel 81.1K Jan 4 15:32 2013-01-04-153221_1024x768_scrot.png
-rw-r--r-- 1 root wheel 120K Jan 4 15:38 desktop.jpg
Now we have screenshot in .jpg format.
How to take screenshot of window, or region ?
Use "scrot -s" command, pres ENTER, left mouse click, define region, release click, wait for prompt:
# scrot -s $t windows.jpg
# ls -hl
total 876
-rw-r--r-- 1 root wheel 94.2K Jan 4 15:25 2013-01-04-152547_1024x768_scrot.png
-rw-r--r-- 1 root wheel 95.5K Jan 4 15:29 2013-01-04-152940_1024x768_scrot.png
-rw-r--r-- 1 root wheel 81.1K Jan 4 15:32 2013-01-04-153221_1024x768_scrot.png
-rw-r--r-- 1 root wheel 120K Jan 4 15:38 desktop.jpg
-rw-r--r-- 1 root wheel 41.8K Jan 4 15:42 windows.jpg
New file is windows.jpg, and that file is smaller, because region for shot is smaller than whole screen.
Scrot program have option to define shot width, height, to execute additional command after taking shot (copy to another dir), etc.
Check man page for your version of scrot.
