Difference between pages "Sed" and "Find out a window's application"

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imported>ThorstenStaerk
 
imported>ThorstenStaerk
(Created page with "If you have a window on your desktop and you want to know which application it belongs to, open a console and enter the command xprop you will get an output like [...] WM_...")
 
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[[sed]] is a [[command]] to edit a text stream in [http://en.wikipedia.org/wiki/Batch_mode batch mode].
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If you have a window on your desktop and you want to know which application it belongs to, [[open a console]] and enter the command
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xprop
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For example,
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you will get an output like
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  sed "s/a/o/"
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[...]
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Will read your input (stream) from the keyboard and '''s'''ubstitute every '''a''' by an '''o'''.
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  WM_CLIENT_LEADER(WINDOW): window id # 0x3200001
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'''_NET_WM_PID(CARDINAL) = 7661'''
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= Usecases =
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WM_LOCALE_NAME(STRING) = "en_US.UTF-8"
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* Remove leading white space
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WM_CLIENT_MACHINE(STRING) = "tweedleburg"
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sed 's/^[ \t]*//'
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WM_NORMAL_HINTS(WM_SIZE_HINTS):
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* Replace strings
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                program specified minimum size: 0 by 0
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  sed -e "s/cgi?\([0-9][0-9]*\)/cgi@\1.html/g" myfile.html > index.html
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                window gravity: NorthWest
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* Insert a line a beginning of file
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  WM_PROTOCOLS(ATOM): protocols  WM_DELETE_WINDOW, WM_TAKE_FOCUS, _NET_WM_PING, _NET_WM_SYNC_REQUEST
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  sed -i '1i <This is now at the first line>' <filename>
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  '''WM_CLASS(STRING) = "Navigator", "Firefox"'''
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* Replace several newlines by one
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[...]
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sed 's/\ \{1,\}/\ /g'
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From this you can tell that the application identifies itself as "Navigator", "Firefox". If this is too unsure for you, have a look at the process ID PID, which is 7661 in the above example:
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* change the protocol for a given port in /etc/services:
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  ps -A |grep 7661
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  sed -ri "s/.{16}3200/sapdp00 3200/" /etc/services
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  7661 ?        01:00:53 firefox-bin
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By this you see that the [[process]] that manages the Window is number 7661 and called firefox-bin.
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= Limitations =
 
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You cannot use sed to delete linebreaks, for this you must use tr.
 
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= See also =
 
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* [[Bash Skripting Tutorial]]
 
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* [[piping]]
 
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* [[grep]]
 
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* [[regex]]
 

Revision as of 08:28, 16 June 2012

If you have a window on your desktop and you want to know which application it belongs to, open a console and enter the command 

xprop

you will get an output like 

[...]
WM_CLIENT_LEADER(WINDOW): window id # 0x3200001
_NET_WM_PID(CARDINAL) = 7661
WM_LOCALE_NAME(STRING) = "en_US.UTF-8"
WM_CLIENT_MACHINE(STRING) = "tweedleburg"
WM_NORMAL_HINTS(WM_SIZE_HINTS):
                program specified minimum size: 0 by 0
                window gravity: NorthWest
WM_PROTOCOLS(ATOM): protocols  WM_DELETE_WINDOW, WM_TAKE_FOCUS, _NET_WM_PING, _NET_WM_SYNC_REQUEST
WM_CLASS(STRING) = "Navigator", "Firefox"
[...]

From this you can tell that the application identifies itself as "Navigator", "Firefox". If this is too unsure for you, have a look at the process ID PID, which is 7661 in the above example: 

ps -A |grep 7661
 7661 ?        01:00:53 firefox-bin

By this you see that the process that manages the Window is number 7661 and called firefox-bin.

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