03-14-2008
Quote:
Originally Posted by
cfajohnson
[INDENT]
You don't need ''sed'' or ''awk''; the shell has parameter expansion that is much faster than calling an external utility.
for a simple case like OP's, true. however if it comes from a file, especially if its big file, it might be faster to use awk/sed.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Can I use my own variables within awk and sed for example:
I've written a while loop with a counter $i and I want to use the value of $i within sed and awk to edit certain lines of text within a data file.
I want to use :
sed '1s/$/texthere/g' data.csv
Like this:
sed '$is/$/$age/g' data.csv... (5 Replies)
Discussion started by: mustaine85
5 Replies
2. Shell Programming and Scripting
ok this is probably going to turn out to be something really stupid but i've tried to use the following command in a script but the output is just a blank screen and i have to use Ctrl c to exit it.
awk 'BEGIN {printf "%.2f\n", '${bashArray}'>='$Variable' {print '${bashArray}'}}'
the command... (2 Replies)
Discussion started by: zagreus360
2 Replies
3. Shell Programming and Scripting
Ok, this one isn't for everybody, it's pretty tough and I've spent a good deal of time on it without figuring it out yet.
Can anybody get this script to work:
#!/bin/bash
cq_fname="%let outputfile="/user/cq_"$1".csv";"
sed "29s/.*/\"$cq_fname\"/" file1.sas >... (3 Replies)
Discussion started by: nocloud
3 Replies
4. UNIX for Dummies Questions & Answers
Hi,
After looking at the differents post on this forum, I am convinced that I will benefit from the experience of advanced Unix user on some script I have already done for an aeronautical study. Here is one of them :
Step 1 :
sed -e "s/??/00/g" Base_Awk.txt > Awk_Cut_00.txt4;
sed... (11 Replies)
Discussion started by: Marc_Camoc
11 Replies
5. Shell Programming and Scripting
I'm relatively new to bash scripting and am trying to use awk inside a bash for loop but am having a problem with the variables.
for i in $(seq 30 5 60)
do
# Define variables up and down in AWK
eval $(awk 'BEGIN{ print "up=$((i+1))"}' < /dev/null)
eval $(awk 'BEGIN{ print... (2 Replies)
Discussion started by: lily-anne
2 Replies
6. Shell Programming and Scripting
Trying to do so
echo "111:222:333" |awk -F: '{system("export TESTO=" $2)}'But it doesn't work (2 Replies)
Discussion started by: urello
2 Replies
7. Debian
Hi Guys
I have another problem I'm trying to solve and hope that some one can help me here.
This is the scenario:
I have a file and I want to add a line on the 3rd line of the file using a bash script. but instead its adding the the bash variable $WEBSITE.
Below is the bash script I'm... (6 Replies)
Discussion started by: linuxjunkie
6 Replies
8. Shell Programming and Scripting
Hi,
I have a file(testfile.txt) that contains list of variables as shown below. T
$$FirstName=James
$$LastName=Fox
$$Dateofbirth=1980-02-04
……and so on there are 50 different variables.
I am writing a script(script1.sh) that will update the above three variable one by one with the values... (6 Replies)
Discussion started by: Saanvi1
6 Replies
9. Shell Programming and Scripting
I have a file as follows:
0
1056
85540
414329
774485
1208487
1657519
2102753
2561259
3037737
3458144
3993019
4417959
4809964
5261890
5798778
6254146
I want to find all lines between a specified start and end tag. (6 Replies)
Discussion started by: jamie_123
6 Replies
10. Shell Programming and Scripting
Hello experts!
I have a file1 with the following format (yr,day, month, hour,minute):
201201132435
201202141210
201304132030
201410100110
...
What i want to do is to assign variables and then use them in the curl command to download the text of each event from a web page.
What I have... (6 Replies)
Discussion started by: phaethon
6 Replies
LEARN ABOUT LINUX
shtool-subst
SHTOOL-SUBST.TMP(1) GNU Portable Shell Tool SHTOOL-SUBST.TMP(1)
NAME
shtool-subst - GNU shtool sed(1) substitution operations
SYNOPSIS
shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext]
[-e|--exec cmd] [-f|--file cmd-file] [file] [file ...]
DESCRIPTION
This command applies one or more sed(1) substitution operations to stdin or any number of files.
OPTIONS
The following command line options are available.
-v, --verbose
Display some processing information.
-t, --trace
Enable the output of the essential shell commands which are executed.
-n, --nop
No operation mode. Actual execution of the essential shell commands which would be executed is suppressed.
-w, --warning
Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution
operations resulted in no content change on all files.
-q, --quiet
Suppress warning on substitution operation resulting in no content change.
-s, --stealth
Stealth operation. Preserve timestamp on file.
-i, --interactive
Enter interactive mode where the user has to approve each operation.
-b, --backup ext
Preserve backup of original file using file name extension ext. Default is to overwrite the original file.
-e, --exec cmd
Specify sed(1) command directly.
-f, --file cmd-file
Read sed(1) command from file.
EXAMPLE
# shell script
shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch]
# RPM spec-file
%install
shtool subst -v -n
-e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g'
-e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g'
`find . -name Makefile -print`
make install
HISTORY
The GNU shtool subst command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 2001 for GNU shtool. It was prompted
by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications.
SEE ALSO
shtool(1), sed(1).
18-Jul-2008 shtool 2.0.8 SHTOOL-SUBST.TMP(1)