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Top Forums Shell Programming and Scripting Pass the first date and last date of previous month Post 302400599 by alister on Wednesday 3rd of March 2010 04:30:19 PM
Old 03-03-2010
Hi, vigdmab:

This works here and should be portable to posix-compliant systems.

Code:
$ ./vigdmab.sh 
02/01/2010 02/28/2010

$ cat vigdmab.sh
#!/bin/sh

month_year=$(date +'%m %Y' | awk '!--$1{$1=12;$2--}1')
m=${month_year% *}
y=${month_year##* }
d=$(cal $m $y | paste -s - | awk '{print $NF}')
first_date=$(printf '%02d/01/%s' $m $y)
last_date=$(printf '%02d/%s/%s' $m $d $y)
echo $first_date $last_date

Obviously, change the echo command at the end to whatever you need to execute.

Regards,
Alister
 

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ECHO(1) 						    BSD General Commands Manual 						   ECHO(1)

NAME
echo -- write arguments to the standard output SYNOPSIS
echo [-n] [string ...] DESCRIPTION
The echo utility writes any specified operands, separated by single blank (' ') characters and followed by a newline (' ') character, to the standard output. The following option is available: -n Do not print the trailing newline character. This may also be achieved by appending 'c' to the end of the string, as is done by iBCS2 compatible systems. Note that this option as well as the effect of 'c' are implementation-defined in IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002. Applications aiming for maximum portability are strongly encouraged to use printf(1) to sup- press the newline character. Some shells may provide a builtin echo command which is similar or identical to this utility. Most notably, the builtin echo in sh(1) does not accept the -n option. Consult the builtin(1) manual page. EXIT STATUS
The echo utility exits 0 on success, and >0 if an error occurs. SEE ALSO
builtin(1), csh(1), printf(1), sh(1) STANDARDS
The echo utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002. BSD
April 12, 2003 BSD
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