osx - Bash + Replace string/value in column -


file: /etc/newsyslog.conf

i trying replace 3rd column (the count column) of each line. appears though first , second columns separated tabs. however, second , third columns separated spaces.

i can value of third column, each line, via:

grep /var /etc/newsyslog.conf | cut -d ' ' -f 3

however, having trouble setting/replacing value in third column. problem don't know value of third column given line. makes difficult, using method know, search/replace specific (third column) value/string.

thanks or advice may able offer.

edit: should have mentioned mac os 10.6 system.

better use awk here avoid multiple commands:

awk '/\/var/{print $3}'

edit:

awk 'begin{ofs="\t"} /\/var/{$3="14"}1' /etc/newsyslog.conf > temp mv temp /etc/newsyslog.conf

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