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Top Forums UNIX for Dummies Questions & Answers Deleting contents of a UNIX File Post 302209455 by manas6 on Friday 27th of June 2008 03:07:09 AM
Old 06-27-2008
Deleting contents of a UNIX File

Hi ALL,

Can anyone help me out.

I have unix file, I need to delete the contents of the file. Can any one let me know the command to do this.

The file has to be there, but the contents should be deleted.


thanks

Manas
 

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GRID-MAPFILE-DELET(8)						  Globus Commands					     GRID-MAPFILE-DELET(8)

NAME
grid-mapfile-delete-entry - Remove entries from a gridmap file SYNOPSIS
grid-mapfile-delete-entry [-help] [-usage] [-version] [-versions] grid-mapfile-delete-entry {-dn DISTINGUISHED-NAME} {-ln LOCAL-NAME...} [[-d] | [-dryrun]] [[-mapfile MAPFILE] | [-f MAPFILE]] DESCRIPTION
The grid-mapfile-delete-entry program deletes mappings from a gridmap file. If both the -dn and -ln> options are specified, grid-mapfile-delete-entry removes entries which meet both criteria (remove entries mapping DISTINGUISHED-NAME to LOCAL-NAME for each LOCAL-NAME specified). If only -dn or -ln is specified all entries for that DISTINGUISHED-NAME or LOCAL-NAME are removed. By default, grid-mapfile-delete-entry will modify the gridmap file named by the GRIDMAP environment variable if present, or the file /etc/grid-security/grid-mapfile if not. This can be changed by the use of the -mapfile or -f command-line options. Prior to modifying a gridmap file, grid-mapfile-delete-entry saves its current contents to a file with the string .old appended to the original file name. The full set of command-line options to grid-mapfile-delete-entry are: -help, -usage Display the command-line options to grid-mapfile-delete-entry. -version, -versions Display the version number of the grid-mapfile-delete-entry command. The second form includes more details. -dn DISTINGUISHED-NAME The X.509 distinguished name to remove from the gridmap file. If the -ln option is not specified, remove all entries for this name; otherwise, remove entries that match both this name and the local name. The name should be in OpenSSL's oneline format. -ln LOCAL-NAME... The POSIX user name to remove from the gridmap file. Include multiple LOCAL-NAME strings after the -ln command-line option to remove multiple names from the gridmap. If the -dn option is not specifeid, remove all entries for these names; otherwise, remove entries that match the DISTINGUISHED-NAME and any of the LOCAL-NAME values. -d, -dryrun Display diagnostics about what would be removed from the gridmap file, but don't actually modify the file. -mapfile MAPFILE, -f MAPFILE Modify the gridmap file named by MAPFILE instead of the default. EXAMPLES
Remove all mappings for a distinguished name: % grid-mapfile-delete-entry "/DC=org/DC=example/DC=grid/CN=Joe User" Modifying /etc/grid-security/grid-mapfile ... Deleting entry: "/DC=org/DC=example/DC=grid/CN=Joe User" juser,juser2 (1) entry deleted Remove the mapping between a distinguished name and a single local username: % grid-mapfile-delete-entry "/DC=org/DC=example/DC=grid/CN=Joe User" -ln juser2 Modifying /etc/grid-security/grid-mapfile ... Current entry: "/DC=org/DC=example/DC=grid/CN=Joe User" juser (1) mapping removed: (juser2), (0) not present and ignored (0) entries deleted ENVIRONMENT VARIABLES
The following environment variables affect the execution of grid-mapfile-delete-entry: GRIDMAP Path to the default gridmap to modify. FILES
The following files affect the execution of grid-mapfile-delete-entry: /etc/grid-security/grid-mapfile Path to the default gridmap to modify if GRIDMAP environment variable is not set. SEE ALSO
grid-mapfile-add-entry(8), grid-mapfile-check-consistency(8) AUTHOR
University of Chicago Globus Toolkit 5.0.1 03/19/2010 GRID-MAPFILE-DELET(8)
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