Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Help on cat with sed!
Top Forums Shell Programming and Scripting Help on cat with sed! Post 302338869 by kbalaji_uk on Wednesday 29th of July 2009 06:13:50 AM
Old 07-29-2009
Ok edidata to be more specific and clear cat x | sed 's/A/a/g' > x. Where x is say a file then the output in one case is empty i.e file x is now empty even the old content is gone. In another case x which had some text with 'A' has replace with 'a' and is written into file. BTW checked sed version cat version linux kernel version all are same in the box only difference is one is faster than the other in speed.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

How to use cat command in sed pattern searching

Hi All, I have a file named pattern.dat which contains pattern like A1000090 250.00 250.00 i have one more file named test.dat in which this pattern is present. What i should do is, in test.dat after this pattern i should append comments. i used... (4 Replies)
Discussion started by: Sona
4 Replies

2. UNIX for Advanced & Expert Users

use of sed over cat to merge files

I have three files, basically: file 1 - one line header file 2 - big data (approx 80GB) file 3 - a one line trailer the existing process cats these together i.e cat file 1 file 2 file 3 however... I was thinking, surely it could be more efficient to insert the header (file 1) on the... (2 Replies)
Discussion started by: miwinter
2 Replies

3. UNIX for Dummies Questions & Answers

Difference between cat , cat > , cat >> and touch !!!

Hi Can anybody tell the difference between Difference between cat , cat > , cat >> and touch command in UNIX? Thanks (6 Replies)
Discussion started by: skyineyes
6 Replies

4. UNIX for Dummies Questions & Answers

tr, sed, awk, cat or scripting

I need to change all Newline caracters (\12) to Fieldseparator(\34). tr -A '\12' '\34' <file1> file2 Replace all delete (\177) with Newline (\12) tr -A '\177' '\12' <file2> file3 Put the name of the file first in all rows. awk '{printf "%s\34%s\n", FILENAME,$0} file3 > file4 So far no... (6 Replies)
Discussion started by: MrKlint
6 Replies

5. Shell Programming and Scripting

want to pass sentence with SED and CAT

I have to pass a sentence in a file, the specs are as: cat run | sed 's/SRT/'$8'/g' | sed 's/plength/68/g' | sed 's/stcol/'$5'/g' | sed 's/encol/'$6'/g' | sed 's/brdtype/'$1'/g' | sed 's/brdtxt/'$3'/g' | sed 's/demotxt/Total '$2'/g' | sed 's/bantxt/ban_'$7'/g' | sed 's/validcodes/'$4'/g' > runx... (1 Reply)
Discussion started by: patilrakesh1984
1 Replies

6. Shell Programming and Scripting

grep or cat using sed

Is there a way using grep or cat a file to create a new file based on whether the first 9 positions of each record is less than 399999999? This is a fixed file format. (3 Replies)
Discussion started by: ski
3 Replies

7. UNIX for Advanced & Expert Users

cat / sed process weird characters

Hi everyone, I'm trying to write a shell script that process a log file. The log format is generally: (8 digit hex of unix time),(system ID),(state)\n My shell script gets the file from the web, saves it in a local text directory. I then want to change the hex to decimal, convert from unix time... (7 Replies)
Discussion started by: bencpeters
7 Replies

8. UNIX for Dummies Questions & Answers

emulating cat in sed with q option

Hi, I am aware that the below are the equivalent in sed for cat command. sed ':' sed -n 'p' Is there any way to emulate the same using "q" option in sed? Thanks (8 Replies)
Discussion started by: pandeesh
8 Replies

9. UNIX for Dummies Questions & Answers

How to cat via ssh and sed at the same time.?

I am trying to write a script to automatically create conf files and remote servers. I would like to do all this without creating files locally and copying them . Here is what I have tried. sitename=$1 prodserver=$2 ssh $prodserver "cat > /data/$sitename.conf" << cat |sed... (5 Replies)
Discussion started by: macrossm
5 Replies

10. Shell Programming and Scripting

Need to add prefix using sed or awk from cat the file

I need the use sed or AWK using cat the file Node1 TDEV RW 1035788 TDEV RW 1035788 Server1 TDEV RW 69053 Server2 TDEV RW 69053 TDEV RW 103579 Server3 TDEV RW 69053 server4 RDF1+TDEV RW 69053 RDF1+TDEV RW 517894 RDF1+TDEV RW 621473 server6 TDEV RW 34526 TDEV RW 34526 (22 Replies)
Discussion started by: ranjancom2000
22 Replies

LEARN ABOUT REDHAT

gzexe

GZEXE(1)						      General Commands Manual							  GZEXE(1)

NAME

       gzexe - compress executable files in place

SYNOPSIS

       gzexe [ name ...  ]

DESCRIPTION

       The  gzexe  utility  allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a
       penalty in performance).  For example if you execute ``gzexe /bin/cat'' it will create the following two files:
	   -r-xr-xr-x  1 root  bin   9644 Feb 11 11:16 /bin/cat
	   -r-xr-xr-x  1 bin   bin  24576 Nov 23 13:21 /bin/cat~
       /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file.  You can remove /bin/cat~ once  you  are	sure  that
       /bin/cat works properly.

       This utility is most useful on systems with very small disks.

OPTIONS

       -d     Decompress the given executables instead of compressing them.

SEE ALSO

       gzip(1), znew(1), zmore(1), zcmp(1), zforce(1)

CAVEATS

       The  compressed	executable  is a shell script. This may create some security holes. In particular, the compressed executable relies on the
       PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep).

BUGS

       gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually  in  some  cases,
       using chmod or chown.

																	  GZEXE(1)
All times are GMT -4. The time now is 11:15 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy