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How it has returned what is expected. Using CYGWIN_NT-5.1

awk '{if (toupper($1) ~ /A/) print $0}' inv

Input file :

$ cat inv

Jan 13 25 15 115
Feb 15 32 24 226
Mar 15 24 34 228...

My concern is that in first case, it should pick "A" only not "a" irrespective of the position.

$ awk '{if (toupper($1) ~ /A/) print $0}' inv -- Why this output
Jan 13 25 15 115
Mar 15 24 ...

Hi,

I am learning awk and faced few queries. Kindly suggest on the same. Where it is wrong.

$ awk '{if (toupper($1) ~ /a/) print $0}' inv

$ awk '{if (toupper($1) ~ /A/) print $0}' inv --...