04-19-2013
Probably best to start a new thread to solve this other interesting problem. Include the input, expected output, and what you have tried, using code tags.
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1. Shell Programming and Scripting
Hello,
My appologies for asking a very basic question but...
In a shell, I enter:
echo tit | sed -e s/tit/tat/g
This returns:
tat
as expected.
But when I enter:
set test = `echo tit | sed -e s/tit/tat/g`
echo $test
This returns an empty line.
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2. Shell Programming and Scripting
I have tried everything I can think of to get sed to change line N of a file to the contents of a variable. I have Googled the Internet, and I find lots of people telling how to use variables with the "Substitute" command, but no one telling how to use variables with the "Change" command.
I... (4 Replies)
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3. Shell Programming and Scripting
This i will print the second line of a file
sed -n '2p' test2
The use of a variable is impossible here.
a=1
while ; do
line=`sed -n '$a p' test2`
# do some things here with the line variable
a=`expr $a + 1`
done
But the uotput of sed command is 'p'..... What can i do to use a variable... (2 Replies)
Discussion started by: hakermania
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4. Shell Programming and Scripting
Ok, so, let's say I have the variable $GMAILID....How can I use it with sed command so to replace a string in a file? e.g.:
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Discussion started by: hakermania
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5. Red Hat
Hi all,
Hereby wish to have your advise for below:
Main concept is
I intend to get current directory of my script file.
This script file will be copied to /etc/init.d.
A string in this copy will be replaced with current directory value.
Below is original script file:
... (6 Replies)
Discussion started by: cielle
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6. Shell Programming and Scripting
I have a file having some text like:
PATH_ABC=/user/myLocation
I have to replace "/user/myLocation" with a session variable say, $REPLACE_PATH,
where $REPLACE_PATH=/user/myReplaceLocation
The following sed command is not working. It is writing PATH_ABC=$REPLACE_PATH in the file
... (2 Replies)
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7. Shell Programming and Scripting
Hi,
I have a file where I want to replace the 15th field separated by comma, only on specific lines matching lots of different conditions.
I have managed to read the file line by line, within the loop my line is held in a variable called $line
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8. Shell Programming and Scripting
for file in `ls /tmp/*_sw_list`; do
/usr/bin/sed -i '' '1,/^Software\ Update/d' $file
done
In my script, this doesn't work. I can copy-and-paste it, and it works. Enabling debugging shows it is resolving the file name correctly... it isn't an issue with special characters in the filename. ... (3 Replies)
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9. Shell Programming and Scripting
My current line command is as follows:
echo -n "text: " ; grep "blah text" ../dir1/filename | wc -l
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10. UNIX for Beginners Questions & Answers
Hi All
I have one file with multiple lines in it, each line has static text and some variable enclosed in <<filename>> as well. e.g. as below
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LEARN ABOUT DEBIAN
go-show-paths-to-root
GO-SHOW-PATHS-TO-ROOT(1p) User Contributed Perl Documentation GO-SHOW-PATHS-TO-ROOT(1p)
NAME
go-show-paths-to-root.pl - shows all possible paths from a term to the top
SYNOPSIS
go-show-paths-to-root.pl -id GO:0008021 ontology/gene_ontology.obo
go-show-paths-to-root.pl -names -id GO:0008021 ontology/gene_ontology.obo
DESCRIPTION
traverses DAG showing all paths (terms and intervening relationships) to the root
This script is purely file based; it needs to parse the ontology each time
Subsequent parses can be speeded up using the use_cache option
If you wish to use the GO MySQL db, see the script go-db-show-paths-to-root.pl in the go-db-perl distribution
ARGUMENTS
-e ERRFILE
writes parse errors in XML - defaults to STDERR (there should be no parse errors in well formed files)
-p FORMAT
determines which parser to use; if left unspecified, will make a guess based on file suffix. See below for formats
-use_cache
If this switch is specified, then caching mode is turned on.
With caching mode, the first time you parse a file, then an additional file will be exported in a special format that is fast to parse.
This file will have the same filename as the original file, except it will have the ".cache" suffix.
The next time you parse the file, this program will automatically check for the existence of the ".cache" file. If it exists, and is more
recent than the file you specified, this is parsed instead. If it does not exist, it is rebuilt.
DOCUMENTATION
<http://www.godatabase.org/dev>
perl v5.14.2 2010-05-12 GO-SHOW-PATHS-TO-ROOT(1p)