Sponsored Content
Full Discussion: Clearing file contents
Special Forums Hardware Filesystems, Disks and Memory Clearing file contents Post 302073845 by raghukayyar on Thursday 18th of May 2006 07:15:58 AM
Old 05-18-2006
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 filename').

Are there any other UNIX commands which will empty the file contents?

Regards,
Raghavendra
 

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
sbdadm(1M)						  System Administration Commands						sbdadm(1M)

NAME
sbdadm - SCSI Block Disk command line interface SYNOPSIS
sbdadm create-lu [-s, --size size] filename sbdadm delete-lu lu_name sbdadm import-lu lu_name sbdadm list-lu lu_name sbdadm modify-lu [-s, --size size] lu_name | filename DESCRIPTION
The sbdadm command creates and manages SCSI-block-device-based logical units that are registered with the SCSI Target Mode Framework (STMF). SUB-COMMANDS The sbdadm command supports the subcommands listed below. Note that if you enter a question mark as an argument to the command (sbdadm ?), sbdadm responds with a help display. create-lu [-s, --size size] filename Create a logical unit that can be registered with the STMF. For the -s option, size is an integer followed by one of the following let- ters, to indicate a unit of size: k kilobyte m megabyte g gigabyte t terabyte p petabyte e exabyte If you do not specify size, the size defaults to the size of filename. The size specified can exceed the size of the file or device. delete-lu lu_name Deletes an existing logical unit that was created using sbdadm create-lu. This effectively unloads the logical unit from the STMF framework. Any existing data on the logical unit remains intact. import-lu lu_name Imports and loads a logical unit into the STMF that was previously created using sbdadm create-lu and was since deleted from the STMF using sbdadm delete-lu. On success, the logical unit is again made available to the STMF. filename is the filename used in the sbdadm create-lu command for this logical unit. list-lu List all logical units that were created using the sbdadm create-lu command. modify-lu [-s, --size size] lu_name | filename Modifies attributes of an logical unit created using the sbdadm create-lu command. For the -s option, size is an integer value followed by a unit specifier. The unit specifiers are as described above under create-lu. When this option is specified, the existing size of the logical unit is changed to the new size. The size specified can exceed the size of the file or device represented by lu_name. OPERANDS
sbdadm use the following operands: filename Name of an existing file or a fully qualified path to a raw block device. lu_name The 32-byte hexadecimal representation of the logical unit. EXAMPLES
Example 1 Creating a Logical Unit The following series of commands creates a 10-gigabyte logical unit. # touch /export/lun/0 # sbdadm create-lu -s 10g /export/lun/0 # sbdadm create-lu /dev/rdsk/c1t1d0s0 Example 2 Listing Logical Units The following command lists all logical units. # sbdadm list-lu Found 2 LU(s) GUID DATA SIZE SOURCE -------------------------------- ----------- ------ 6000ae4000144f21d92c47b0dd650002 10737352704 /export/lun/0 6000ae4000144f21d92c47b0de300032 134283264 /dev/rdsk/c1t1d0s0 EXIT STATUS
0 Successful completion. non-zero An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWstmfu | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ SEE ALSO
stmfadm(1M), attributes(5) SunOS 5.11 12 Jun 2008 sbdadm(1M)
All times are GMT -4. The time now is 08:04 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy