awk -i inplace '$1=="namespace" && !seen[ARGIND]++ {$0=$0 ORS "foo"} 1' *
FS=" "
is the default, no need to specify it explicitly.
Domanda
awk -i inplace '
BEGIN {FS=" "}
BEGINFILE {changed=0}
{ print;if ($1 == "namespace" && !changed) {print "foo";changed=1} }
' *
Is there a more elegant way to do this? Some built-in construct I missed? I am running GNU Awk 4.1.0 (and I am superb glad for -i inplace).
Soluzione
awk -i inplace '$1=="namespace" && !seen[ARGIND]++ {$0=$0 ORS "foo"} 1' *
FS=" "
is the default, no need to specify it explicitly.
Altri suggerimenti
You could say:
... -F' ' '$1 == "namespace" && !a {$0=$0 RS "foo";a=1}1' file
or even:
... -F' ' '$1 == "namespace" && !_ {$0=$0 RS "foo";_=1}1' file
As mentioned in the comment above, this is pretty similar to what you've written except that it uses the RS
variable to insert the text.
In order to do this for multiple files, you'd need to reset the variable:
... -F' ' 'BEGINFILE {a=0} $1 == "namespace" && !a {$0=$0 RS "foo";a=1}1' *
or
... -F' ' 'FNR==1 {a=0} $1 == "namespace" && !a {$0=$0 RS "foo";a=1}1' *