01-18-2002
I'm not trying to be a jerk here, but there is not reason to be using "cat" in any of the above example.
Instead of
cat a.txt | sed -e "s/ //g"
you can do:
sed 's/ //g' a.txt
and for this one:
cat a.txt | awk 'gsub(" ", "")'
you can do:
awk 'gsub(" ","")' a.txt
You can always pipe to those commands, but there's no need to use cat to dump a file.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I'm having a file with 5 fields.
I want to sort that file according to one field
no 3. How shall I do using awk programming.
Any input appreciatable.
regards,
vadivel. (7 Replies)
Discussion started by: vadivel
7 Replies
2. Shell Programming and Scripting
Hi all,
column1
--------
33
44
55
66
please provide the script using awk command to dispaly output 55.
Help apperciated..
thanks,
Nirmal (4 Replies)
Discussion started by: abnirmal
4 Replies
3. Shell Programming and Scripting
Hello,
Iam trying to get the IP of the hostname of the machine from /etc/hosts.
I used the command as below:
But the result shows the IP with the hostname..
like
192.168.0.8 test12111.com
I need to get only 192.168.0.8
Please help
Thanks in advance
esham (11 Replies)
Discussion started by: esham
11 Replies
4. Shell Programming and Scripting
hi
how to get the values in two columns (may be 2nd and 5th column) of a file line by line.
either i want to get the two fields into different variables and use a for loop to get these values line by line. (3 Replies)
Discussion started by: Pradee
3 Replies
5. Shell Programming and Scripting
Hi ,
I have a file in the below format:
1.txt
awk 'BEGIN { printf ("%1s", "man" )} '
awk 'BEGIN { printf ("%9s", "women" )} '
awk 'BEGIN { printf ("%56s", "human")} '
##
###
##
echo "$!"
##
awk 'BEGIN { printf ("%1s", "aaa" )} '
awk 'BEGIN { printf ("%19s", "bbb" )} ' ... (4 Replies)
Discussion started by: jisha
4 Replies
6. Shell Programming and Scripting
Hi All,
I have two files as given below:
fileA
1234|aaaaa|vvvv
2222|bbbbbb|cbxxbjh
3333|cccc|jhjhj
fileB
3434|bbbcc|cbxxbjh
1234|cat|bullet
3333|cccc|jhjhj
I need a script that reads the first column from fileA (i.e 1234) and searches in fileB in the first parameter(i.e first... (7 Replies)
Discussion started by: jisha
7 Replies
7. Shell Programming and Scripting
I have executed the below command:
find . -name "Ks*" -type f -exec ls -ltr {} \; | awk '{printf("%ld %s %d %s \n",$5,$6,$7,$8,$9)}'
and here is the output:
1282 Oct 7 2004
51590 Jul 10 2006
921 Oct 7 2004
1389 Jun 4 2003
1037 May 19 2004
334 Mar 24 2004
672 Jul 8 2003
977... (6 Replies)
Discussion started by: venkatesht
6 Replies
8. Shell Programming and Scripting
I have a file sample.txt with the following contents:
the following gives output as
awk 'NF{s=$0; print s}' sample.txt
but,
awk 'NF{s=$0}{print s}' sample.txtgives output as
why this difference, can someone explain me? (6 Replies)
Discussion started by: royalibrahim
6 Replies
9. UNIX for Dummies Questions & Answers
instead of writing print command in awk, i saw in some posts that we can simply write a number before we end the awk command and it will print the file.
As given below:
$awk '{some manipulation; print}' filename
$awk '{some manipulation}1' filename
I also tried replacing the... (2 Replies)
Discussion started by: PranavEcstasy
2 Replies
10. Shell Programming and Scripting
Hi,
I got a below requirement from this forum, but the solution provided was not clear.
Below is the requirement
Input file
A 1 Z
A 1 ZZ
B 2 Y
B 2 AA
Required output
B Y|AA
A Z|ZZ (5 Replies)
Discussion started by: stew
5 Replies
LEARN ABOUT REDHAT
dos2unix
dos2unix(1) General Commands Manual dos2unix(1)
NAME
dos2unix - DOS/MAC to UNIX text file format converter
SYNOPSYS
dos2unix [options] [-c convmode] [-o file ...] [-n infile outfile ...]
Options:
[-hkqV] [--help] [--keepdate] [--quiet] [--version]
DESCRIPTION
This manual page documents dos2unix, the program that converts plain text files in DOS/MAC format to UNIX format.
OPTIONS
The following options are available:
-h --help
Print online help.
-k --keepdate
Keep the date stamp of output file same as input file.
-q --quiet
Quiet mode. Suppress all warning and messages.
-V --version
Prints version information.
-c --convmode convmode
Sets conversion mode. Simulates dos2unix under SunOS.
-o --oldfile file ...
Old file mode. Convert the file and write output to it. The program default to run in this mode. Wildcard names may be used.
-n --newfile infile outfile ...
New file mode. Convert the infile and write output to outfile. File names must be given in pairs and wildcard names should NOT be
used or you WILL lost your files.
EXAMPLES
Get input from stdin and write output to stdout.
dos2unix
Convert and replace a.txt. Convert and replace b.txt.
dos2unix a.txt b.txt
dos2unix -o a.txt b.txt
Convert and replace a.txt in ASCII conversion mode. Convert and replace b.txt in ISO conversion mode. Convert c.txt from Mac to Unix
ascii format.
dos2unix a.txt -c iso b.txt
dos2unix -c ascii a.txt -c iso b.txt
dos2unix -c mac a.txt b.txt
Convert and replace a.txt while keeping original date stamp.
dos2unix -k a.txt
dos2unix -k -o a.txt
Convert a.txt and write to e.txt.
dos2unix -n a.txt e.txt
Convert a.txt and write to e.txt, keep date stamp of e.txt same as a.txt.
dos2unix -k -n a.txt e.txt
Convert and replace a.txt. Convert b.txt and write to e.txt.
dos2unix a.txt -n b.txt e.txt
dos2unix -o a.txt -n b.txt e.txt
Convert c.txt and write to e.txt. Convert and replace a.txt. Convert and replace b.txt. Convert d.txt and write to f.txt.
dos2unix -n c.txt e.txt -o a.txt b.txt -n d.txt f.txt
DIAGNOSTICS
BUGS
The program does not work properly under MSDOS in stdio processing mode. If you know why is that so, please tell me.
AUTHORS
Benjamin Lin - <blin@socs.uts.edu.au>
Bernd Johannes Wuebben (mac2unix mode) <wuebben@kde.org>
MISCELLANY
Tested environment:
Linux 1.2.0 with GNU C 2.5.8
SunOS 4.1.3 with GNU C 2.6.3
MS-DOS 6.20 with Borland C++ 4.02
Suggestions and bug reports are welcome.
SEE ALSO
unix2dos(1) mac2unix(1)
1995.03.31 dos2unix v3.0 dos2unix(1)