I want to make a comand that can replace particular number in Unix file sysytem for eg:-ZAR     ZEC      ZDA-9         2      34          8      -95          6      7I have  ZAR, ZEC, ZDA  as my header and -9 in ZDA must be replaced by +9. What command should I write so it will change in particular that number without changing others value like -9 present in ZAR field.
Replacement of particular number in unix files
linux;shell script;sed;awk