05-27-2006
Quote:
Originally Posted by raghukayyar
Are there any other UNIX commands (apart from '>filename) which can be used to clear the file contents?
There is some command called shred which overrides file's contents, but it's not effective with many filesystems suchs as JFS, XFS, ReiserFS... and those which doesn't overwrite data in place.
Salut
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
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
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
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
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
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
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
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 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
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
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
MKFS(8) System Administration MKFS(8)
NAME
mkfs - build a Linux filesystem
SYNOPSIS
mkfs [options] [-t type] [fs-options] device [size]
DESCRIPTION
mkfs is used to build a Linux filesystem on a device, usually a hard disk partition. The device argument is either the device name (e.g.
/dev/hda1, /dev/sdb2), or a regular file that shall contain the filesystem. The size argument is the number of blocks to be used for the
filesystem.
The exit code returned by mkfs is 0 on success and 1 on failure.
In actuality, mkfs is simply a front-end for the various filesystem builders (mkfs.fstype) available under Linux. The filesystem-specific
builder is searched for in a number of directories, like perhaps /sbin, /sbin/fs, /sbin/fs.d, /etc/fs, /etc (the precise list is defined at
compile time but at least contains /sbin and /sbin/fs), and finally in the directories listed in the PATH environment variable. Please see
the filesystem-specific builder manual pages for further details.
OPTIONS
-t, --type type
Specify the type of filesystem to be built. If not specified, the default filesystem type (currently ext2) is used.
fs-options
Filesystem-specific options to be passed to the real filesystem builder. Although not guaranteed, the following options are sup-
ported by most filesystem builders.
-V, --verbose
Produce verbose output, including all filesystem-specific commands that are executed. Specifying this option more than once
inhibits execution of any filesystem-specific commands. This is really only useful for testing.
-V, --version
Display version information and exit. (Option -V will display version information only when it is the only parameter, otherwise it
will work as --verbose.)
-h, --help
Display help and exit.
BUGS
All generic options must precede and not be combined with filesystem-specific options. Some filesystem-specific programs do not support
the -V (verbose) option, nor return meaningful exit codes. Also, some filesystem-specific programs do not automatically detect the device
size and require the size parameter to be specified.
AUTHORS
David Engel (david@ods.com)
Fred N. van Kempen (waltje@uwalt.nl.mugnet.org)
Ron Sommeling (sommel@sci.kun.nl)
The manual page was shamelessly adapted from Remy Card's version for the ext2 filesystem.
SEE ALSO
fs(5), badblocks(8), fsck(8), mkdosfs(8), mke2fs(8), mkfs.bfs(8), mkfs.ext2(8), mkfs.ext3(8), mkfs.ext4(8), mkfs.minix(8), mkfs.msdos(8),
mkfs.vfat(8), mkfs.xfs(8), mkfs.xiafs(8)
AVAILABILITY
The mkfs command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
util-linux June 2011 MKFS(8)