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Full Discussion: Calculating start and end of UK summertime
Top Forums Shell Programming and Scripting Calculating start and end of UK summertime Post 302517624 by esb4me on Wednesday 27th of April 2011 09:58:57 AM
Old 04-27-2011
Calculating start and end of UK summertime
I have a need to calculate when British Summer Time starts and ends. After messing around, the following seems to work in Bash.

Code:
echo `date +%Y`-03-`cal 3 \`date +%Y\` | grep -oE "^[[:digit:]]{2}" | tail 
-1`T01:00:00Z

and

Code:
echo `date +%Y`-03-`cal 10 \`date +%Y\` | grep -oE "^[[:digit:]]{2}" | tail 
-1`T01:00:00Z

Are there better ways? Would this method work for other countries?
 

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LEARN ABOUT V7

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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