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Full Discussion: Best way to edit a file
Top Forums Shell Programming and Scripting Best way to edit a file Post 302480378 by skunky on Tuesday 14th of December 2010 05:46:27 PM
Old 12-14-2010
Best way to edit a file

looking for a script or command to push out from a centralized machine to multiple machines. I have the software in place that will do this already, but I need to tell it what command to run on each machine with this file.

what I need is a script or command to edit a file in a specific manner. Say I have a file such as the one below. What I need to do is search the file for a specific line, in this case the line "users_here[tab space]u1=usera,userb,userc", and delete the text "usera,". I don't want it to remove ALL instances of "usera" throughout the file, and I don't want to output this to a new file. I need to search the file for the line, remove 'usera' if it's in THAT specific line, and leave the file intact after it edits/removes "usera" from that line. Any help with this?

#
user_goHere
user2_goHere
users_here[tab space]u1=usera,userb,userc
users_there[tab space]u2=user1,user2,user3

here is more text in the file that also contains usera, but i don't want it delete this one. here's another usera, but i don't want it to remove this either.
and here is some more text in the file.
#
 

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IDLE(1) 						      General Commands Manual							   IDLE(1)

NAME
IDLE - An Integrated DeveLopment Environment for Python SYNTAX
idle [ -dins ] [ -t title ] [ file ...] idle [ -dins ] [ -t title ] ( -c cmd | -r file ) [ arg ...] idle [ -dins ] [ -t title ] - [ arg ...] DESCRIPTION
This manual page documents briefly the idle command. This manual page was written for Debian because the original program does not have a manual page. For more information, refer to IDLE's help menu. IDLE is an Integrated DeveLopment Environment for Python. IDLE is based on Tkinter, Python's bindings to the Tk widget set. Features are 100% pure Python, multi-windows with multiple undo and Python colorizing, a Python shell window subclass, a debugger. IDLE is cross-plat- form, i.e. it works on all platforms where Tk is installed. OPTIONS
-h Print this help message and exit. -n Run IDLE without a subprocess (see Help/IDLE Help for details). The following options will override the IDLE 'settings' configuration: -e Open an edit window. -i Open a shell window. The following options imply -i and will open a shell: -c cmd Run the command in a shell, or -r file Run script from file. -d Enable the debugger. -s Run $IDLESTARTUP or $PYTHONSTARTUP before anything else. -t title Set title of shell window. A default edit window will be bypassed when -c, -r, or - are used. [arg]* and [file]* are passed to the command (-c) or script (-r) in sys.argv[1:]. EXAMPLES
idle Open an edit window or shell depending on IDLE's configuration. idle foo.py foobar.py Edit the files, also open a shell if configured to start with shell. idle -est "Baz" foo.py Run $IDLESTARTUP or $PYTHONSTARTUP, edit foo.py, and open a shell window with the title "Baz". idle -c "import sys; print sys.argv" "foo" Open a shell window and run the command, passing "-c" in sys.argv[0] and "foo" in sys.argv[1]. idle -d -s -r foo.py "Hello World" Open a shell window, run a startup script, enable the debugger, and run foo.py, passing "foo.py" in sys.argv[0] and "Hello World" in sys.argv[1]. echo "import sys; print sys.argv" | idle - "foobar" Open a shell window, run the script piped in, passing '' in sys.argv[0] and "foobar" in sys.argv[1]. SEE ALSO
python(1). AUTHORS
Various. 21 September 2004 IDLE(1)
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