05-16-2018
Quote:
Originally Posted by
yifangt
This is one of what I wanted to confirm.
To explain the exact problem: You can't insert data into the middle of a file, just overwrite it from that point forwards. So you can't edit without completely overwriting everything after that point, unless your data is made of fixed-size records.
This User Gave Thanks to Corona688 For This Post:
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Write a nawk script that will produce the following report:
***FIRST QUARTERLY REPORT***
***CAMPAIGN 2004 CONTRIBUTIONS***
-------------------------------------------------------------------------
NAME PHONE Jan | ... (5 Replies)
Discussion started by: p.palakj.shah
5 Replies
2. Shell Programming and Scripting
I want to print between the range two patterns if a particular pattern is present in between the two patterns. I am new to Unix. Any help would be greatly appreciated.
e.g.
Pattern1
Bombay
Calcutta
Delhi
Pattern2
Pattern1
Patna
Madras
Gwalior
Delhi
Pattern2
Pattern1... (2 Replies)
Discussion started by: joyan321
2 Replies
3. Shell Programming and Scripting
Hi guys, trying to replace a '#' with a ' ' (space) but only between the brackets '(' and ')'
N="text1#text2#text3(var1#var2#var3)"
N=`echo $N |sed '/(/,/) s/#. //'`
echo $N
Looking for an output of "text1#text2#text3(var1 var2 var3)"
Any ideas? (15 Replies)
Discussion started by: mikepegg
15 Replies
4. Shell Programming and Scripting
I've a file say having
line 1
line 2
(NP
line 3
line 4
line 5)
line 6
I want to combine lines starting from (NP and ending with ) then it will look like
line 1
line 2
(NP line3 line4 line5)
line 6
I tried using sed '/(NP/,/)$/ s/\n/ /' but it's not working. Any help please?
... (8 Replies)
Discussion started by: neg
8 Replies
5. Shell Programming and Scripting
Still trying to get the basics down and I would like a different solution to what I'm currently doing and a better understanding of why it's happening. I've written a simple backup script that tars individual directories and then dumps them to a NFS drive. STDERR is being dumped into a process... (2 Replies)
Discussion started by: mandelbrot333
2 Replies
6. Shell Programming and Scripting
Hi Experts,
I've issue with the huge file.
My requirement is I need to search a pattern between the 155-156 position and if its match's to 31 or 36 then need to route that to a new separate files.
The main file has around 1459328 line and 2 GB in size. I tired with the below code which take... (9 Replies)
Discussion started by: senthil.ak
9 Replies
7. Shell Programming and Scripting
Hi Everyone!
I really appreciate all of your help, I'm learning so much, can't wait until I get good enough to start answering questions!
I have a problem ... from one large file, I'd like to create multiple new files for each pattern block
beginning with /^ISA/
ending with /^IEA/
... (2 Replies)
Discussion started by: verge
2 Replies
8. UNIX for Dummies Questions & Answers
Hi,
I have a Huge 7 GB file which has around 1 million records, i want to split this file into 4 files to contain around 250k messages each.
Please help me as Split command cannot work here as it might miss tags..
Format of the file is as below
<!--###### ###### START-->... (6 Replies)
Discussion started by: KishM
6 Replies
9. Shell Programming and Scripting
Hi all,
I have been searching all over Google but I am unable to find a solution for a particular result that I am trying to achieve.
Consider the following input:
1
2
3
4
5
B4Srt1--Variable-0000
B4Srt2--Variable-1111
Srt
6
7
8
9
10
End (3 Replies)
Discussion started by: y2jacky
3 Replies
10. Shell Programming and Scripting
I have config file like this:
server_name xx opt1 opt2 opt3
suboptions1
#suboptions - disabled
suboptions2 pattern
suboptions3
server_name yy opt1 opt2 opt3
suboptions1 pattern
#suboptions - disabled
suboptions2
So basically I want to extract the server... (1 Reply)
Discussion started by: nemesis911
1 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)