Yes, "sed" needs an input. This is a basic requirement of all such utilities. sed can take its input from stdin or from referencing a file.
Example 1:
Code:
cmd | cmd | cmd | sed '1,2d'
Note: "cmd" is simply some scripting command or a UNIX utility.
Example 2:
Code:
sed '1,2d' your_really_big_file
Quote:
It doesn't appear to be working.
This is because sed is expecting keyboard entries. Try it again and enter a bunch of lines and when you press CTRL-D on your keyboard, you'll see the expected results: all lines except the top two will be reprinted on your screen.
Happy New Year!!!
I'm trying to cut out some text in a data file where I only want the first line and the last line.
For example.
1. Colin Was here <<-- Text I want to cut out
2. THIS IS THE TEXT I WANT TO CUT <- CUT THIS OUT
3. OUT BECAUSE IT'S NO GOOD TO ME <- CUT THIS OUT
4. I... (5 Replies)
Hi,
I have this problem of separating 10 consecutive lines from a file, say starting from 21 to 30... I have used a filter like this..
head -n 30 myfile | tail -n 10
Is there a simpler way than this? (2 Replies)
Hi,
I have a file named Mani.txt. The contents are like this
cat Mani.txt
--------------------------------------------------------
Hi there how r u
My Name is Mani
Bye
------------------------------------------------------------
I want to cut the first and last lines from the file... (15 Replies)
Dear All,
Is there a way to cut the lines that have been "head"
Here is what i m trying to do Please advice
there is file name dummy.txt
now i am trying to head this file 4 time by using a loop and every time this file is head with different values
e.g in first instance it will... (7 Replies)
Please see the following code, between "status" and "OK" exists many spaces, I want to get status OK . how to ignore multi spaces? If tab exists in the spaces, how to ignore it ?
Is there other commands can replace cut?
$ echo 'drv status OK'| cut... (3 Replies)
Hi.
I am not sure how to solve this problem and if it is possible to do so with scripting. :wall:
Let's say I have this data:
A 12345 12360
A 12359 12380
A 12381 12390
A 12400 12450
A 12451 12460
B 23456 23460
B 23470 23480
B 23477 23505
I wan't each line to be compared in this... (5 Replies)
Oracle Linux 6.4
In a directory I have more than 300 files with the extension .log
I want the first 5 and last 5 lines of these .log files to be printed on screen with each file's name.
Expected output :
Printing first 5 and last 5 lines of FX_WT_Feb8_2014.log
!! Authentication... (7 Replies)
I am trying to remove columns 81-97 from a line that can be as long as 114 characters. Because a number of lines might not have under 80 characters, using the cut command following by paste could be a problem. While sed might work, is there some other utility that could do this more easily?
... (9 Replies)
Discussion started by: wbport
9 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)