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Get first four characters from the variable name

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# 1  
Old 08-13-2014
Get first four characters from the variable name
Hi all

I have a variable name as below

Code:
runbatch=FCSTworLOADfx_CYR

Now i need to search for FCST in this variable and run a program

I am doing like this but it is failing

Code:
if [${RUNBATCH} |grep "FCST" == "FCST" ]; then ****RUN PROGRAM**

Please help

DJ

Moderator's Comments:
Mod Comment Please use CODE tags when displaying sample input, output, and code samples.
Last edited by Don Cragun; 08-13-2014 at 05:53 AM.. Reason: Add CODE tags.
# 2  
Old 08-13-2014
Code:
if [[ "$(echo $runbatch | grep FCST)" != "" ]]; then echo "find";fi

This User Gave Thanks to protocomm For This Post:
Hypesslearner
# 3  
Old 08-13-2014
Code:
if [[ $(grep "FCST" <<<${runbatch}) ]]; then ***RNU PROGRAM***

This User Gave Thanks to SriniShoo For This Post:
Hypesslearner
# 4  
Old 08-13-2014
Quote:
Originally Posted by Hypesslearner
Hi all

I have a variable name as below

Code:
runbatch=FCSTworLOADfx_CYR

Now i need to search for FCST in this variable and run a program

I am doing like this but it is failing

Code:
if [${RUNBATCH} |grep "FCST" == "FCST" ]; then ****RUN PROGRAM**

Please help

DJ

Moderator's Comments:
Mod Comment Please use CODE tags when displaying sample input, output, and code samples.
This can all be done with standard variable expansions without needing to invoke utilities that aren't built into the shell:
Code:
if [ "${runbatch#*FCST}" != "$runbatch" ]
then    ****Run Program***
fi

You said run the program if FCST appears in $runbatch. If you meant if FCST appears as the 1st four characters in $runbatch, change "${runbatch#*FCST}" to "${runbatch#FCST}".

Note that spaces around [ and ] are crucial and shell variable names are case sensitive.
This User Gave Thanks to Don Cragun For This Post:
protocomm
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