C Shell & Bourne & Bash Shell DATE 포멧 문자열 파싱? shell substring

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CShell & Boune & Bash Shell DATE 포멧 문자열 파싱?

- CShell

 #!/bin/csh
 set dynamic_date=`date '+%Y%m%d%H%M%S'`
 set SUB_DATE=`echo ${dynamic_date} | awk '{print substr($1,0,10)}'`
 echo $SUB_DATE

- Bourne Shell

 #!/bin/sh
 dynamic_date=`date '+%Y%m%d%H%M%S'`
 echo $dynamic_date
 SUB_DATE=`expr substr $dynamic_date 1 6`
 echo $SUB_DATE

- Bash Shell

 #!/bin/bash
 dynamic_date=`date '+%Y%m%d%H%M%S'`
 echo $dynamic_date
 SUB_DATE=${dynamic_date:0:6}
 echo $SUB_DATE