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Top Forums Shell Programming and Scripting if [ $NOWDATE -gt $STARTDATE ] , date comparison correct syntax? Post 302369356 by durden_tyler on Saturday 7th of November 2009 05:24:01 PM
Old 11-07-2009
Quote:
Originally Posted by danpaluska
...
Code:
# a bunch of initializition steps are here ...
STARTDATE=`date +%Y%m%d`
 
while [ 1 ] # loop running all the time. 
do

NOWDATE=`date +%Y%m%d`

# if day changes then i want to reinitialize
if [ $NOWDATE -gt $STARTDATE ] 
then
# do all that initiallization again 
fi

# ... a bunch of other code in here

done

but that if statement doesn't work. any tips?
...
Did you wait long enough ?

The value of NOWDATE will change when the day changes. So if you start your script and keep it running till midnight (when the day changes), the "if" condition will return true thereafter.

Code:
$
$ cat -n t1.sh
     1  #!/bin/bash
     2
     3  # a bunch of initializition steps are here ...
     4  STARTDATE=`date +%Y%m%d`
     5  echo "STARTDATE = $STARTDATE"
     6
     7  NOWDATE=`date +%Y%m%d`
     8  if [ $NOWDATE -gt $STARTDATE ]; then
     9    echo "in if (-gt)  : NOWDATE = $NOWDATE"
    10  else
    11    echo "in else (-le): NOWDATE = $NOWDATE"
    12  fi
    13
    14  NOWDATE="20091108"
    15  if [ $NOWDATE -gt $STARTDATE ]; then
    16    echo "in if (-gt)  : NOWDATE = $NOWDATE"
    17  else
    18    echo "in else (-le): NOWDATE = $NOWDATE"
    19  fi
    20
$
$ . t1.sh
STARTDATE = 20091107
in else (-le): NOWDATE = 20091107
in if (-gt)  : NOWDATE = 20091108
$
$

tyler_durden
 

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fstrcmp(1)						      General Commands Manual							fstrcmp(1)

NAME
fstrcmp - fuzzy comparison of strings SYNOPSIS
fstrcmp [ -p ] first-string second-string fstrcmp -w first-string second-string fstrcmp -a first-file second-file fstrcmp -s needle haystack... fstrcmp --version DESCRIPTION
The fstrcmp command is used to make fuzzy comparisons between strings. The "edit distance" between the strings is printed, with 0.0 mean- ing the strings are utterly un-alike, and 1.0 meaning the strings are identical. You may need to quote the string to insulate them from the shell. OPTIONS
The fstrcmp command understands the following options: -a --files-as-bytes This option is used to compare two files as arrays of bytes. See fmemcmp(3) for more information. -p --pair This option is used to compare two strings as arrays of bytes. This is the default. See fstrcmp(3) for more information. -s --select This option is used to select the closest needle from the provided haystack alternatives. The most similar (single) choice is printed. If none are particularly similar, nothing is printed. See fstrcmp(3) for more information. See below for example. -V --version This option may be used to print the version of the fstrcmp command, and then exit. -w --wide-pair This option is used to compare two multi-byte character strings. See fstrcoll(3) for more information. EXIT STATUS
The fstrcmp command exits with status 1 on any error. The fstrcmp command only exits with status 0 if there are no errors. EXAMPLE
The fstrcmp --select option may be used in a shell script to improve error messages. case "$action" in start) start ;; stop) stop ;; restart) stop start ;; *) echo "$0: action "$action" unknown" 1>&2 guess=`fstrcmp --select "$action" stop start restart` if [ "$guess" ] then echo "$0: did you mean "$guess" instead?" 1>&2 fi exit 1 ;; esac Thus, the error message frequently suggests the correct action in the face of simple finger problems on the command line. SEE ALSO
fstrcmp(3) fuzzy comparison of strings fstrcoll(3) fuzzy comparison of two multi-byte character strings fstrcmpi(3) fuzzy comparison of strings, integer variation COPYRIGHT
fstrcmp version 0.4 Copyright (C) 2009 Peter Miller Peter Miller <pmiller@opensource.org.au> The comparison code is derived from the fuzzy comparison functions in GNU Gettext 0.17. The GNU Gettext comparison functions were, in turn, derived from GNU Diff 2.7. Copyright (C) 1988-2009 Free Software Foundation fstrcmp(1)
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