With modern awks, you can just do it like you would in C (though the justification is less clear; C doesn't have the trivial in-line string concatenation that awk does), like so: {{{ awk maxlen=0 for (i in arr) if (maxlen<length(arr[i])) maxlen=length(arr[i]) for (i in arr) printf("%-*s %s\n",maxlen,arr[i],i) }}} With old awks, just do it like you would do if you didn't know about %* (this would be much more painful to do in C), like so: {{{ awk maxlen=0 for (i in arr) if (maxlen<length(arr[i])) maxlen=length(arr[i]) printfstring="%-" maxlen "s %s\n"; for (i in arr) printf(printfstring,arr[i],i) }}}
Summary:
This change is a minor edit.
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