how to change some text of a certain line of a text file with bash and *nix scripting

alred · 07-05-2006, 10:19 AM

how to change some text of a certain line of a text file with bash and *nix scripting ??

i could have use pascal to do that but ...

how to do it with bash , awk , sed or whatever the *nix guys like to do ??

eg ::
theres a file with the content of ::

Code:

...
private final int invokeThreadK=3;
private final int invokeRunnableK=4;
private final int invokeK_MaxCount=5;
/////////////////////////////////////////////////////////////////////////////////////////////////////  
private final String thisAddr="192.168.1.15";
private boolean terminated = false;
final String bttext="mb01buttton"  ;
...

when i execute a script file something like "dobuild 192.168.1.1"

the above file will be updated to ::

Code:

...
private final int invokeThreadK=3;
private final int invokeRunnableK=4;
private final int invokeK_MaxCount=5;
/////////////////////////////////////////////////////////////////////////////////////////////////////  
private final String thisAddr="192.168.1.1";
private boolean terminated = false;
final String bttext="mb01buttton"  ;
...

//thanks in advance ...

.

MensaWater · 07-05-2006, 11:07 AM

Code:

sed s/192.168.1.15/192.168.1.1/ inputfile >outputfile

The above will find any occurrence of 192.168.1.15 in input file and replace it with 192.168.1.1 and write all lines into outputfile. You can then

Code:

mv inputfile inputfile.DATESTAMP 
mv outputfile inputfile

This will save a copy of your original inputfile before overwriting it with what you changed in the outputfile.

alred · 07-05-2006, 11:34 AM

let me catch some breath first ...

...

ok ...

great and fast , thanks ...

i believe your code works but what if i want to "search" for the occurance of private final String thisAddr= and change the remaining text until the end of line ...

probably i should give a "dobuild "192.168.1.1"" or something ??

what should i do ??

.

Hobbletoe · 07-05-2006, 12:08 PM

Try as your "dobuild" script ...

Code:

#!/bin/bash

TEMP=$(mktemp /tmp/tmpxxxx)
sed 's/\(private final String thisAddr=\)\(.\)*/\1'$1'/' file_name > $TEMP
mv $TEMP/file_name

exit

Substituting the name of your file instead of file_name, obviously.

alred · 07-05-2006, 12:33 PM

thank to both of you and the hints on doing things more carefully ... they work great ...

.

eddiebaby1023 · 07-09-2006, 01:38 PM

Quote:

Originally Posted by Hobbletoe

Try as your "dobuild" script ...

Code:

sed 's/\(private final String thisAddr=\)\(.\)*/\1'$1'/'

Waste of typing saving the original IP address:

Code:

sed 's/\(private final String thisAddr=\).*/\1'$1'/'

alred · 07-10-2006, 11:55 AM

this one also works great ...

strange erhh ... ^_^

.