Shell Programming and Scripting

totrow=`cal $1 2006 |grep -v "^$"| wc -l`

cal $1 2006 | grep -v "^$"|nawk -v rowcount="$totrow" -v inday="$2" '{if(NR == r
owcount){
day="sun mon tue wed thu fri sat"
split( day, weekday," ")
if ( weekday[NF] == inday) {
print inday " is last in month"
}
else {
print inday " is not last in month"
}

}}'

This is for last

cal $1 2006 | nawk -v inday="$2" '{ if( NR == 3 ){
daycount= 8 - NF
day="sun mon tue wed thu fri sat"
split( day, weekday," ")
print weekday[daycount]
if( weekday[daycount] == inday ) {
print inday " is first day of the month"
}else {
print inday " is not first day of the month"
}
}}'

to get first day

Alternative with GNU date and bash shell.

Check if today's week day is the last of the month

Code:

[ $(date  --date '7 days' +%m) != $(date +%m)  ] && echo "last"

Check if the week day of a particular date is the last of the month

Code:

[ $(date  --date '2006-12-22 7 days' +%m) != $(date --date '2006-12-22' +%m)  ] && echo "last"