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Full Discussion: If Error then Exit
Top Forums Shell Programming and Scripting If Error then Exit Post 302674965 by 244an on Saturday 21st of July 2012 03:02:43 AM
Old 07-21-2012
Quote:
Originally Posted by bakunin
...
Code:
command && echo "error occurred"

The second variant uses the logical meaning of non-zero being FALSE, the "&&" is a logical "OR": that way, if "command" returns "FALSE", the second command is executed, otherwise not.

I hope this helps.

bakunin
I think "&&" is the logical "AND", "||" means "OR", so it should be
Code:
 command || echo "error occurred"

This User Gave Thanks to 244an For This Post:
 

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LVMCHANGE(8)						      System Manager's Manual						      LVMCHANGE(8)

NAME
lvmchange - change attributes of the logical volume manager SYNOPSIS
lvmchange [-d|--debug] [-f|--force] [-h|--help] {[-i|--iop_verion]| [-R|--reset]} [-v|--verbose] DESCRIPTION
lvmchange allows you to reset the logical volume manager. Please be careful to have all logical volumes closed and/or unused! OPTIONS -d, --debug Enables additional debugging output (if compiled with DEBUG). -f, --force Force the action without confirmation. -h, --help Print a usage message on standard output and exit successfully. -i, --iop_version Display the LVM io protocol version. This version number ensures that no incompatible data is passed to the driver. -R, --reset Emergency reset of the logical volume manager. This function is a "last resort" if something goes wrong to allow the the logical volume manager module to be unloaded. Not used in normal operation. Please be careful NOT to reset when logical volumes are in use!!! -v, --verbose Gives verbose information about lvmchange's activities. Example "lvmchange -fR" resets the logical volume manager without confirmation. DIAGNOSTICS
lvmchange returns an exit code of 0 for success or > 0 for error: 1 error opening logical volume manager 2 error resetting logical volume manager 95 driver/module not in kernel 96 invalid I/O protocol version 97 error locking logical volume manager 99 invalid command line See also lvm(8), vgcreate(8), lvcreate(8) AUTHOR
Heinz Mauelshagen <Linux-LVM@Sistina.com> Heinz Mauelshagen LVM TOOLS LVMCHANGE(8)
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