Synopsis:

 Execute a shell command and save the result as a variable.

Description of application:

 Backticks(<VARNAME>|<command>)
 
 <VARNAME> - The name of the variable to be set.
 <command> - The shell command to execute; be sure to provide the full path to the command.  I used sh, but I think any language will do.

Description of function:

 Backticks(<command>)
 
 <command> - Same as above.

Notes

• *CLI> show application BACKTICKS
• *CLI> show function BACKTICKS

This application is not distributed as part of Asterisk.
S

Return value

Returns the resulting string.

Example

• application:

exten => s,1,BACKTICKS(FOO|/your/path/command.sh)   ; sets FOO to result, see here for more info

• function:

exten => s,1,Set(FOO=${BACKTICKS(/your/path/command.sh ${arg1} ${arg2})})   ; sets FOO to result, I only could get the "function" to take arguments

• command.sh:

#!/bin/sh
x=0
if [ -e "/some/path/$1/caller-$2.ulaw" ]; then x=1; fi /* see man test for info on the if argument */
echo $x

The above takes two args, checks for the existence of the file, if it exists return 1, else return 0; i.e. the resulting value of foo.

install

Download from You can download it from http://www.freeswitch.org/asterisk_stuff/app_backticks.c
Follow his install instructions except:
# you may want to save app_backticks.c to /usr/src/asterisk
# for his step 3, cd /usr/src/asterisk first and then execute /usr/src/asterisk/contrib/scripts/astxs -install app_backticks.c

See also

• Asterisk func SHELL - A similar functionality as an Asterisk function
• Asterisk cmd System
• Asterisk func exists
• Asterisk variables
• Asterisk functions

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• Asterisk - documentation of application commands