01-03-2013
Quote:
Originally Posted by
santiagorf
Hi all,
What is the difference between these two comands?
sed s/a/b/ <f1 >f2
sed s/a/b/ f1 >f2
Best,
santiagorf
The results from those two commands should be the same.
The difference between them is that in the first case, the shell opens f1 as standard input to be read by sed. In the second case, sed opens and reads f1 using a file descriptor that might or might not (but probably won't) be the standard input file descriptor for sed.
9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
hello,
i'm looking for the sources of the old, original unices (v3 preferred). could someone point a link? (2 Replies)
Discussion started by: fdarkangel
2 Replies
2. UNIX for Dummies Questions & Answers
All,
I have worked with UNIX for quite a while but never with raid. My section has just taken control of 3 servers each with different configurations and all running raids. My question for everyone is can you recommend any books that I can purchase or web sites that deal specifically with how to... (1 Reply)
Discussion started by: 3grls=1hd8
1 Replies
3. Linux
I"m installing my ATI card in FC4. I'm going off of instructions that i've found. The firs step says that i need my kernel sources which i've got then it says that i've gotta unpack them so i can make links to the file later. My kernel sources that i've got are .src.rpm I've installed them but... (1 Reply)
Discussion started by: byblyk
1 Replies
4. Linux
Hi guys!
I have a problem to create a makefile when using 2 types of sources.
Suppose we have sources at master_source folder:
- 1.c
- 2.c
and also we have sources at platform_source folder:
- 1.c
I really need to use platform_source folder because there is many of them (one folder with... (8 Replies)
Discussion started by: borzh62
8 Replies
5. SuSE
Hi all.
I have an issue with kernel patching.
My system: OpenSuse 10.2, kernel version: 2.6.18.2.
I've downloaded the patch from kernel.org - 2.6.26. I've invoked the following command:
"patch -p1 -f < patch-2.6.26" (-f - because some files are not exist. to automatically skip this issues).... (2 Replies)
Discussion started by: Vourhey
2 Replies
6. News, Links, Events and Announcements
So, I was browsing groklaw.net, and I was surprised to read that Pamela Jones was reading the copyright notices in the UnixWare 7.1.1 source code files...
Groklaw - Santa Cruz Listed Novell as Owning the Copyrights in 1999
How can that be? Are the UnixWare 7.1.1 sources available to the... (1 Reply)
Discussion started by: pepinox
1 Replies
7. Solaris
Everyone knows the project LFS (Linux from scratch), it is a book-assembly instructions GNU / Linux from source code. I managed to gather, then my knowledge of GNU / Linux grew, learned many new commands, edit config-files, base packages, kernel, etc. ..
Now I would like also to explore... (0 Replies)
Discussion started by: Geekon
0 Replies
8. Debian
I'm just interested to know how your sources.list look like. I got some repositories witch give some errors and I would like to clean it up.
and when I do apt-get update I get few lines showing errors like 404 , this is how my list look like:
# deb cdrom:/ squeeze main
# deb cdrom:/... (0 Replies)
Discussion started by: zdorian
0 Replies
9. Programming
I am working in IT company working for banks.I find hardly to get technology about bank IT on the internet.Consider banks all using Unix, I think I can get some help here.
Recommend some sits or books about bank IT will be very helpful!! (0 Replies)
Discussion started by: hhdzhu
0 Replies
LEARN ABOUT DEBIAN
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)