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Full Discussion: Passing output to variable instead of file
Top Forums Shell Programming and Scripting Passing output to variable instead of file Post 302199526 by Furqan_79 on Tuesday 27th of May 2008 06:02:34 AM
Old 05-27-2008
Passing output to variable instead of file
Hi,

In normal shell scripting, how do you pass the output of a command to a variable, instead of a file and be able to use it later?
The code is:

#!/bin/bash

who | cut -d" " -f1 > onlineusers

Instead of passing the output of the above command to the file called 'onlineusers' highlighted in red, how do you pass the output to a variable or to any other sort of container and could be made use of later?
 

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LEARN ABOUT DEBIAN

gmt_shell_functions

GMT_SHELL_FUNCTIONS.SH(1gmt)				       Generic Mapping Tools				      GMT_SHELL_FUNCTIONS.SH(1gmt)

NAME

       gmt_shell_functions.sh - Practical functions to be used in GMT bourne shell scripts

SYNOPSIS

       gmt_init_tmpdir
       gmt_remove_tmpdir
       gmt_clean_up [prefix]
       gmt_message message
       gmt_abort message
       gmt_nrecords file(s)
       gmt_nfields string
       gmt_get_field string
       gmt_get_region file(s) [options]
       gmt_get_gridregion file [options]
       gmt_get_map_width -R -J
       gmt_get_map_height -R -J
       gmt_set_psfile file
       gmt_set_framename prefix framenumber
       gmt_set_framenext framenumber

DESCRIPTION

       gmt_shell_functions.sh  provides  a  set  of  functions to Bourne (again) shell scripts in support of GMT.  The calling shell script should
       include the following line, before the functions can be used:

       . gmt_shell_functions.sh

       Once included in a shell script, gmt_shell_functions.sh allows GMT users to do some scripting more easily  than	otherwise.  The  functions
       made available are:

       gmt_init_tmpdir
	      Creates  a  temporary directory in /tmp or (when defined) in the directory specified by the environment variable TMPDIR. The name of
	      the temporary directory is returned as environment variable GMT_TMPDIR. This function also causes GMT to run  in	`isolation  mode',
	      i.e. all temporary files will be created in GMT_TMPDIR and the .gmtdefaults file will not be adjusted.

       gmt_remove_tmpdir
	      Removes the temporary directory and unsets the GMT_TMPDIR environment variable.

       gmt_cleanup
	      Remove all files and directories in which the current process number is part of the file name.  If the optional prefix is given then
	      we also delete all files and directories that begins with the given prefix.

       gmt_message
	      Send a message to standard error.

       gmt_abort
	      Send a message to standard error and exit the shell.

       gmt_nrecords
	      Returns the total number of lines in file(s)

       gmt_nfields
	      Returns the number of fields or words in string

       gmt_get_field
	      Returns the given field in a string. Must pass string between double quotes to preserve it as one item.

       gmt_get_region
	      Returns the region in the form w/e/s/n based on the data in table file(s). Optionally add -Idx/dy to round off the answer.

       gmt_get_gridregion
	      Returns the region in the form w/e/s/n based on the header of a grid file. Optionally add -Idx/dy to round off the answer.

       gmt_map_width
	      Expects the user to give the desired -R -J settings and returns the map width in the current measurement unit.

       gmt_map_height
	      Expects the user to give the desired -R -J settings and returns the map height in the current measurement unit.

       gmt_set_psfile
	      Create the output PostScript file name based on the base name of a given file (usually the script name $0).

       gmt_set_framename
	      Returns a lexically ordered filename stem (i.e., no extension) given the file prefix and the current frame number, using a width	of
	      6 for the integer including leading zeros.  Useful when creating animations and lexically sorted filenames are required.

       gmt_set_framenext
	      Accepts the current frame integer counter and returns the next integer counter.

NOTES

       1.  These functions only work in the bourne shell (sh) and their derivatives (like ash, bash, ksh and zsh).  These functions do not work in
       the C shell (csh) or their derivatives (like tcsh), and cannot be used in DOS batch scripts either.
       2. gmt_shell_functions.sh were first introduced in GMT version 4.2.2 and have since been regularly expanded with other practical  scripting
       short-cuts. If you want to suggest other functions, please do so by mailing to the GMT mailing list: gmt-help@lists.hawaii.edu.

SEE ALSO

       GMT(1), sh(1), bash(1), minmax(1), grdinfo(1)

GMT 4.5.7							    15 Jul 2011 				      GMT_SHELL_FUNCTIONS.SH(1gmt)
All times are GMT -4. The time now is 11:15 AM.
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