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- #!/bin/rc
- switch($#*){
- case [012]
- echo usage: mkextract [-u] field n file... >[1=2]
- exit 1
- }
- switch($1){
- case -u
- flag=$1; shift
- case *
- flag=''
- }
- field=$1
- n=$2
- shift 2
- fn select {
- awk '
- BEGIN { doprint=0 }
- /^$/ { next }
- /^#/ { next }
- doprint && /^[^ ]/ { doprint=0 }
- doprint { print $'^$n^' }
- $1 ~ "^'^$field^'$" { doprint=1; next }
- ' $*
- }
- switch($flag){
- case -u
- select $* | sort -u
- case *
- select $*
- }
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