Shell Programming and Scripting

nawk -v col=2 -v val=1111111 -v valN=0000000 '$col == val {$col = valN}1' myFile

$ cat test
000000 1111111 2222222
011111 0123445 1234556
023445 1111111 234345
$ nawk -v col=2 -v val=1111111 -v valN=0000000 '$col == val {$cal = valN}1' test
nawk: illegal field $()
 input record number 1, file test
 source line number 1
$

nawk -v col=2 -v val=1111111 -v valN=0000000 '$col == val {$col = valN}1' myFile

# if the VALUE of the field/column referenced by var 'col' equals the value of
# variable 'val' (or OLD value), then assign the value of variable 'valN'
# to the column/field referenced by variable 'col'.
#
'$col == val {$col = valN}1'

#!/bin/ksh

IFS=" \t\n"

current_result=""
final_result=""

while read current_line
do
    
    current_result=""
    
    for current_token in $current_line
    do
        if [[ $current_token = "1111111"  ]]
        then
            current_result="$current_result 0000000"
        else
            current_result="$current_result $current_token"
        fi
    done
    
    current_result="${current_result# }"
    
    final_result="$final_result$current_result\n"
    
done < $1

final_result="${final_result%\\n}"

exec 4> $1
print -u4 "$final_result"

1 <&-
4 >&-