Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Clearing file contents
Special Forums Hardware Filesystems, Disks and Memory Clearing file contents Post 302074238 by vino on Monday 22nd of May 2006 03:21:21 AM
Old 05-22-2006
>filename should work very well.

See this

Code:
[/tmp]$ dd if=/dev/zero of=/tmp/bigfile bs=1000 count=500000
500000+0 records in
500000+0 records out
[/tmp]$ ls -l /tmp/bigfile
-rw-r--r--    1 xxxxxxxx g900     500000000 May 22 00:11 /tmp/bigfile
[/tmp]$ >/tmp/bigfile
[/tmp]$ ls -l /tmp/bigfile
-rw-r--r--    1 xxxxxxxx g900            0 May 22 00:11 /tmp/bigfile
[/tmp]$

Since you notice the file size is still the same, it could be that some process is still using the file (?)
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Creating file contents using contents of another file

Hi, I am not sure how to start doing this so I hope to get some advice as to how to start. I have 2 files. The source file contains data that I needed is in columns delimited by ";". For example, in this format: "CONTINENT","COUNTRY","CITY","ID" "asia","japan","tokyo","123"... (21 Replies)
Discussion started by: ReV
21 Replies

2. Solaris

Clearing file contents

Hi, We need to clear the contents of a file. For this we tried using the commands like - '>filename' and 'cat filename > /dev/null'. If the file size is large, the above commands will clear the file contents but the size of the file remains the same (checked using the command 'ls -l... (2 Replies)
Discussion started by: raghukayyar
2 Replies

3. UNIX for Dummies Questions & Answers

compare 2 file contents , if same delete 2nd file contents

Give shell script....which takes two file names as input and compares the contents, is both are same delete second file's contents..... I try with "diff"...... but confusion how to use "diff" with if ---else Thanking you (5 Replies)
Discussion started by: krishnampkkm
5 Replies

4. UNIX for Dummies Questions & Answers

Help with searching for a file in a directory and copying the contents of that file in a new file

Hi guys, I am a newbie here :wall: I need a script that can search for a file in a directory and copy the contents of that file in a new file. Please help me. :confused: Thanks in advance~ (6 Replies)
Discussion started by: zel2zel
6 Replies

5. Shell Programming and Scripting

I want to delete the contents of a file which are matching with contents of other file

Hi, I want to delete the contents of a file which are matching with contents of other file in shell scripting. Ex. file1 sheel,sumit,1,2,3,4,5,6,7,8 sumit,rana,2,3,4,5,6,7,8,9 grade,pass,2,3,4,5,6,232,1,1 name,sur,33,1,4,12,3,5,6,8 sheel,pass,2,3,4,5,6,232,1,1 File2... (3 Replies)
Discussion started by: ranasheel2000
3 Replies

6. Shell Programming and Scripting

Replace partial contents of file with contents read from other file

Hi, I am facing issue while reading data from a file in UNIX. my requirement is to compare two files and for the text pattern matching in the 1st file, replace the contents in second file by the contents of first file from start to the end and write the contents to thrid file. i am able to... (2 Replies)
Discussion started by: seeki
2 Replies

7. Shell Programming and Scripting

Folder contents getting appended as strings while redirecting file contents to a variable

Hi one of the output of the command is as below # sed -n "/CCM-ResourceHealthCheck:/,/---------/{/CCM-ResourceHealthCheck:/d;/---------/d;p;}" Automation.OutputZ$zoneCounter | sed 's/$/<br>/' Resource List : <br> *************************** 1. row ***************************<br> ... (2 Replies)
Discussion started by: vivek d r
2 Replies

8. Shell Programming and Scripting

Shell script (sh file) logic to compare contents of one file with another file and output to file

Shell script logic Hi I have 2 input files like with file 1 content as (file1) "BRGTEST-242" a.txt "BRGTEST-240" a.txt "BRGTEST-219" e.txt File 2 contents as fle(2) "BRGTEST-244" a.txt "BRGTEST-244" b.txt "BRGTEST-231" c.txt "BRGTEST-231" d.txt "BRGTEST-221" e.txt I want to get... (22 Replies)
Discussion started by: pottic
22 Replies

9. Shell Programming and Scripting

ksh Script, Reading A File, Grepping A File Contents In Another File

So I'm stumped. First... APOLOGIES... my work is offline in an office that has zero internet connectivity, as required by our client. If need be, I could print out my script attempts and retype them here. But on the off chance... here goes. I have a text file (file_source) of terms, each line... (3 Replies)
Discussion started by: Brusimm
3 Replies

10. UNIX for Beginners Questions & Answers

Output file name and file contents of multiple files to a single file

I am trying to consolidate multiple information files (<hostname>.Linux.nfslist) into one file so that I can import it into Excel. I can get the file contents with cat *Linux.nfslist >> nfslist.txt. I need each line prefaced with the hostname. I am unsure how to do this. --- Post updated at... (5 Replies)
Discussion started by: Kentlee65
5 Replies

LEARN ABOUT CENTOS

dh_movefiles

DH_MOVEFILES(1) 						     Debhelper							   DH_MOVEFILES(1)

NAME

       dh_movefiles - move files out of debian/tmp into subpackages

SYNOPSIS

       dh_movefiles [debhelperoptions] [--sourcedir=dir] [-Xitem] [file...]

DESCRIPTION

       dh_movefiles is a debhelper program that is responsible for moving files out of debian/tmp or some other directory and into other package
       build directories. This may be useful if your package has a Makefile that installs everything into debian/tmp, and you need to break that
       up into subpackages.

       Note: dh_install is a much better program, and you are recommended to use it instead of dh_movefiles.

FILES

       debian/package.files
	   Lists the files to be moved into a package, separated by whitespace. The filenames listed should be relative to debian/tmp/. You can
	   also list directory names, and the whole directory will be moved.

OPTIONS

       --sourcedir=dir
	   Instead of moving files out of debian/tmp (the default), this option makes it move files out of some other directory. Since the entire
	   contents of the sourcedir is moved, specifying something like --sourcedir=/ is very unsafe, so to prevent mistakes, the sourcedir must
	   be a relative filename; it cannot begin with a `/'.

       -Xitem, --exclude=item
	   Exclude files that contain item anywhere in their filename from being installed.

       file ...
	   Lists files to move. The filenames listed should be relative to debian/tmp/. You can also list directory names, and the whole directory
	   will be moved. It is an error to list files here unless you use -p, -i, or -a to tell dh_movefiles which subpackage to put them in.

NOTES

       Note that files are always moved out of debian/tmp by default (even if you have instructed debhelper to use a compatibility level higher
       than one, which does not otherwise use debian/tmp for anything at all). The idea behind this is that the package that is being built can be
       told to install into debian/tmp, and then files can be moved by dh_movefiles from that directory. Any files or directories that remain are
       ignored, and get deleted by dh_clean later.

SEE ALSO

       debhelper(7)

       This program is a part of debhelper.

AUTHOR

       Joey Hess <joeyh@debian.org>

11.1.6ubuntu2							    2018-05-10							   DH_MOVEFILES(1)
All times are GMT -4. The time now is 06:12 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy