Suppose I want to pass a string to awk
so that once I split it (on a pattern) the substrings become the indexes (not the values) of an associative array.
Like so:
$ awk -v s="A:B:F:G" 'BEGIN{ # easy, but can these steps be combined?
split(s,temp,":") # temp[1]="A",temp[2]="B"...
for (e in temp) arr[temp[e]] #arr["A"], arr["B"]...
for (e in arr) print e
}'
A
B
F
G
Is there a awkism or gawkism that would allow the string s
to be directly split into its components with those components becoming the index entries in arr
?
The reason is (bigger picture) is I want something like this (pseudo awk):
awk -v s="1,4,55" 'BEGIN{[arr to arr["1"],arr["5"],arr["55"]} $3 in arr {action}'
No, there is no better way to map separated substrings to array indices than:
split(str,tmp); for (i in tmp) arr[tmp[i]]
FWIW if you don't like that approach for doing what your final pseudo-code does:
awk -v s="1,4,55" 'BEGIN{split(s,tmp,/,/); for (i in tmp) arr[tmp[i]]} $3 in arr{action}'
then another way to get the same behavior is
awk -v s=",1,4,55," 'index(s,","$3","){action}'
Probably useless and unnecessarily complex but I'll open the game with while
, match
and substr
:
$ awk -v s="A:B:F:G" '
BEGIN {
while(match(s,/[^:]+/)) {
a[substr(s,RSTART,RLENGTH)]
s=substr(s,RSTART+RLENGTH)
}
for(i in a)
print i
}'
A
B
F
G
I'm eager to see (if there are) some useful solutions. I tried playing around with asort
s and such.
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