Shell Programming and Scripting

14,30
28,30
16,30
22,30
21,30
3,30

echo "14,14" | awk -F"," '$1 != /[:digit:]/ || $2 != /[:digit:]/ {a=1;} END{if(a==1) print "Error in file descriptor file";}'

echo "14,14" | awk -F"," '$1 != /[[:digit:]]/ || $2 != /[[:digit:]]/ {a=1;print $0;} END{if(a==1) print "Error in file descriptor file";}'

echo "14,14" | awk -F"," '$1 !~ /^[1-9]*$/ || $1 ~ /^$/ || $2 !~ /^[1-9]*$/ || $2 ~ /^$/ {a=1;} END{if(a==1) print "Error in file descriptor file"}'

$ cat file
3,30
16,y
x,30

$ awk -F "," '$1 !~ /[[:digit:]]/ || $2 !~ /[[:digit:]]/ { print "Line " NR ": " $0 }' file
Line 2: 16,y
Line 3: x,30

$ grep -v -n "^[[:digit:]]\+,[[:digit:]]\+$" file
2:16,y
3:x,30

$ cat file
14,30
28,30
16,30
22,30
21,30
3,30
28,f
ff,25
ff,ss

$ awk '!/^[0-9]+,[0-9]+/{print NR,$0}' file
7 28,f
8 ff,25
9 ff,ss

$ awk '!/^[,0-9]*$/ {print NR,$0}' file
7 28,f
8 ff,25
9 ff,ss

$ awk -F, '$1+0!=0 && $2+0!=0' a.txt
14,30
28,30
16,30
22,30
21,30
3,30
$ echo "A,B" >> a.txt
$ echo "1,3" >> a.txt
$ cat a.txt
14,30
28,30
16,30
22,30
21,30
3,30
A,B
1,3
$ awk -F, '$1+0!=0 && $2+0!=0' a.txt
14,30
28,30
16,30
22,30
21,30
3,30
1,3
$ awk -F, '$1+0==0 || $2+0==0{print "Not a valid file";exit}' a.txt
Not a valid file