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Full Discussion: ksh case statement
Top Forums Shell Programming and Scripting ksh case statement Post 302268964 by SFNYC on Tuesday 16th of December 2008 03:34:18 PM
Old 12-16-2008
You can try testing your date with something like this:
Code:
$  grep --version
grep (GNU grep) 2.5.1


$ echo '2008-10-10' | grep -Eq '^20[0-9]{2}-(0?[1-9]|1[0-2])-(0?[1-9]|[1-2][0-9]|3[0-1])$'

$ echo $?
0

$ echo '2008-12-16' | grep -Eq '^20[0-9]{2}-(0?[1-9]|1[0-2])-(0?[1-9]|[1-2][0-9]|3[0-1])$'

$ echo $?
0

$ echo '2008-10-99' | grep -Eq '^20[0-9]{2}-(0?[1-9]|1[0-2])-(0?[1-9]|[1-2][0-9]|3[0-1])$'

$ echo $?
1

$echo 'Hello World'  | grep -Eq '^20[0-9]{2}-(0?[1-9]|1[0-2])-(0?[1-9]|[1-2][0-9]|3[0-1])$'

$ echo $?
1

This regex also check for valid dates as best it can. Meaning, it doesn't check for leap year or stuff like 2008-02-31. To do that, I would suggest you write a more sophisitcated function for that. But this one-liner will be sufficient for most of the stuff you want.

Code:
$ echo '2008-92-10' | grep -Eq '^20[0-9]{2}-(0?[1-9]|1[0-2])-(0?[1-9]|[1-2][0-9]|3[0-1])$'

$ echo $?
1

$ echo '20081216' | grep -Eq '^20[0-9]{2}-(0?[1-9]|1[0-2])-(0?[1-9]|[1-2][0-9]|3[0-1])$'

$ echo $?
1

 

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LEARN ABOUT ULTRIX

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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