UNIX for Dummies Questions & Answers

/usr/xpg4/bin/awk  -v cm="${cm# }" -v cy="${cy}" '

/usr/xpg4/bin/awk  -v cm="${cm#0}" -v cy="${cy}" '

report.txt

Last login Wed Aug  7, 2013 on pts/111
Last login Mon Sep 23 17:28 on pts/47 from remb02mkiwsf25
On since Feb 17 15:26:40 on pts/75
On since Jul 25, 2013 on pts/12

+ + date +%m%Y
cmy=022014
+ cm=02
+ cy=2014
+ /usr/xpg4/bin/awk -v cm=2 -v cy=2014 BEGIN{ ML = "JanFebMarAprMayJunJulAugSepOctNovDec"}
function setyear(TorY,M) {
        if(index(TorY, ":") == 0) return(TorY)  # We have a year; not a time.
        m = (index(ML, M) + 2) / 3              # Convert month name to number
        if(m > cm)      return(cy - 1 " " TorY) # return last year + time
        else            return(cy " " TorY)     # return this eyar + time
}
/^On since/ {
        $5 = setyear($3, $5)
}
/^Last login/ {
        $6 = setyear($4, $6)
}
{       print
} report.txt
Last login Wed Aug 7, Aug on pts/111
Last login Mon Sep 23 Sep on pts/47 from remb02mkiwsf25
On since Feb 17 Feb on pts/75
On since Jul 25, Jul on pts/12

function setyear(TorY,M) {

function setyear(M, TorY) {