Shell Programming and Scripting

I have no prior knowledge of Unix shell scripting,but my requriment demands to wrie a script that do fallowing things.
1.Delete older than one year log files
2.Moves files in to the directories as YYYYMM wise.
3.If files in $LOGDIR older than n=2 months tar and move them to $ARCHIVEDIR
4.Removing n=4 months older files from Archive directory

I write a script in ksh .But am getting lot of errors.Can any one help me out.My code is as fallows:

code:log_cln.sh

#!/bin/ksh
#*******************************************************************************
#** Program : log_clean.sh
#**
#** Job Name :
#**
#** Original Author :
#**
#** Description : Script used to archive and clean up files
#**
#** Revision History: Please do not stray from the example provided.
#**
#**
#*****************************************************************************
#test hook
. ~/.setup_env
. $FPATH/common_funcs.sh
#Define varibles used
L_SCRIPTNAME=`basename $0`
curr_year=`date +%Y`
curr_month=`date +%m`
curr_yearmm=`date +%Y%m`
#file_year
#file_mm
#file_yearmm ****variables to hold the file year,mm,yearmm values********
#last_n_yearmm

#
while getopts "s:t:i:d:f" option
do
case $option in
s) start_step=$OPTARG;;
t) data_tablespace=$OPTARG;;
i) index_tablespace=$OPTARG;;
d) debug=1;;
f) date_string=$OPTARG;;
esac
done
shift $(($OPTIND - 1))
#-----------------------------------------------------------------
# Set the default values for all options. This will only set the
# variables which were NOT previously set in the getopts section.
#-----------------------------------------------------------------
debug=${debug:=0}
#-----------------------------------------------------------------
#Check for debug mode [-d]
#-----------------------------------------------------------------
if [ $debug -eq 1 ]; then
set -x
fi
#-----------------------------------------------------------------
# Set $ parameters here.
#-----------------------------------------------------------------

#-------------------------------------------------------------------
#function which takes file's year, month name and retrieve yearmonth
value
#----------------------------------------------------------------------
function get_file_yearmm{ # inputs : file year and month name
#output :files yyyymm
year=$1
mon_name=$2
case $year in
?????)file_year=year;; #for year like 2007 ,wc is 5
*)file_year=curr_year ;; #for current year itz showing something like 11:45 ,wc 6.
esac

case "$mon_name" in
"Jan")file_mm=01;;
"Feb")file_mm=02;;
"Mar")file_mm=03;;
"Apr")file_mm=04;;
"May")file_mm=05;;
"Jun")file_mm=06;;
"Jul")file_mm=07;;
"Aug")file_mm=08;;
"Sep")file_mm=09;;
"Oct")file_mm=10;;
"Nov")file_mm=11;;
"Dec")file_mm=12;;
*) echo " Invalid month" ;;
esac
file_yearmm=${file_year}$file_mm
}
#-------------------------------------------------------------------------------
#function which gives the last nth month yyyymm value from current date
#-------------------------------------------------------------------------------
function get_last_n_yearmm{
yyyy=curr_year
mm=curr_month
n=$1
while [ n -gt 0 ]
do
if [ mm -eq 01 ];then
yyyy=`expr $yyyy - 1`
mm=12
last_n_yearmm=${yyyy}$mm
else
mm=`printf %02d $(expr $mm - 1)`
last_n_yearmm=${yyyy}$mm
fi
n=`expr $n - 1`
done
}
#----------------------------------------------------------------
Function to check the return status and set the appropriate
# message
#-----------------------------------------------------------------
function check_status
{
if [ $? -ne 0 ]; then
err_msg="$L_SCRIPTNAME Errored at Step: $step_number"
echo "$err_msg"
subject_msg="Job Error - $L_SCRIPTNAME"
send_mail "$err_msg" "$subject_msg" "$ERR_LIST"
exit $step_number
fi
}
#-----------------------------------------------------------------
#Begin Main Program
#-----------------------------------------------------------------
check_variables LOGDIR ARCHIVEDIR
#-----------------------------------------------------------------
step_number=1
#Description: Delete older than one year log files
#
#-----------------------------------------------------------------
#
if [ $start_step -le $step_number ] ; then
echo "*** Step Number $step_number.................."
echo "****Deletiing the files older than 1 year....."
cd $LOGDIR
for $file in $LOGDIR
do
file_year=$(ls -l $file | awk '{ print $8 }' )
file_year=$(get_file_yearmm $file_year)
if [ file_year -le $(expr $curr_year -1 ];then
rm -rf $file
check_status
fi
done
fi

#------------------------------------------------------------------
#-----------------------------------------------------------------
step_number=2
#Description: Moves files in to the directories as YYYYMM wise
#-----------------------------------------------------------------
if [ $start_step -le $step_number ] ; then
echo "*** Step Number $step_number"
echo " Moves files in to the directories as YYYYMM wise"
for $file in $LOGDIR
do
file_year=$(ls -l $file | awk '{ print $8 }')
file_mm=$(ls -l $file | awk '{ print $6 }')
file_yearmm=$(get_file_yearmm $file_year $file_mm)
mv $file ./${file_yearmm}/$file
check_status
done
fi
#---------------------------------------------------------------------
#-----------------------------------------------------------------
step_number=3
#Description: If files in $LOGDIR older than n=2 months tar and move
them to $ARCHIVEDIR
#-----------------------------------------------------------------
if [ $start_step -le $step_number ] ; then
echo "*** Step Number $step_number"
echo " tar and moving files to archive directory"
n=2
last_n_yearmm=$(get_last_n_yearmm $n)
cd $LOGDIR
for $file in $LOGDIR
do
file_yearmm=$(ls -l $file |grep "^d"| awk '{ print $9 }')
if [ file_yearmm -le last_n_yearmm ];then
tar -cvf `find . "*.*" -type d `>${file_yearmm}.tar 2>/dev/null
check_status
fi
done
mv $LOGDIR/"*.tar" ${ARCHIVEDIR}
check_status
fi
#------------------------------------------------------------------------
step_number=4
#Description: untar all the files
#
#-------------------------------------------------------------------------
if [ $start_step -le $step_number ] ; then
echo "*** Step Number $step_number"
cd $ARCHIVEDIR
for $file in $ARCHIVEDIR
do
tar -xvf ${file_yearmm}.tar
check_status
done
fi
#--------------------------------------------------------------------------
step_number=5
#Description: Removing n=4 months older files from Archive directory
#--------------------------------------------------------------------------
if [ $start_step -le $step_number ] ; then
echo "*** Step Number $step_number"
echo "Removing n=4 months older files from Archive directory"
n=4
last_n_yearmm=$(get_last_n_yearmm $n)
for $file in $ARCHIVEDIR
do
file_yearmm=$(ls -l $file | awk '{ print $9 }')
if [ file_yearmm -le last_n_yearmm ];then
rm -rf $file
check_status
fi
done
fi
#---------------------------------------------------------------------------
step_number=6
#---------------------------------------
#Description:6 tar all
#---------------------------------------
if [ $start_step -le $step_number ] ; then
echo "*** Step Number $step_number"
cd $ARCHIVEDIR
for $file in $ARCHIVEDIR
do
file_yearmm=$(ls -l $file |grep "^d"| awk '{ print $9 }')

tar -cvf ${file_yearmm} ${file_year}.tar
check_status
done
fi
exit 0
#-----------------------------------------------------------------------------

Post the errors.

Hi era thanks for quick reply.am getting the error.
log_cln.sh[63]: Syntax error at line 66 : `year=$1' is not expected.

You need a space before the opening bracket in function get_file_yearmm{

Is that it? You said a lot of errors. If there are more, please post all of them (after fixing what you can; you seem to have the same error with get_last_n_yearmm).

Thanx era i fixed that error.
when use function syntax like this :
----------------------------------
function get_file_yearmm{
#code
}

-----------------------------------
Errors am getting related to the variables:
variable_name:unexpected

but using the syntax i over come those:
get_file_yearmm()
{
#code
}
--------------
Now up to function calls, code is working fine.I debug some errors.Now am getting error about $file like this :
log_cln.sh[140]: $file: is not an identifier
Am attatching my modified code.

Thanks for replying.

The error message indicates line 140, but it seems to correspond with line 142 (and also on line 159) in your script: the syntax of the for statement is wrong. You should remove the dollar sign in front of the variable name; the correct syntax is

Code:

for file in $LOGDIR

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