read multiple fields separated by : and fields separated by , in loop stored in $var
in [Shell]
|
Prev: read multiple fields separated by : and fields separated by , in loop stored in $var
Next: read multiple fields separated by : and fields separated by , in loop stored in $var
From: Ben Bacarisse on 13 Mar 2010 09:09 Chimu <echimu(a)gmail.com> writes: > I got data in $x separated by :, further each field has 4 values and i > want get those. So i come with IFS and read code > Input > x="tab1,c,1,3,db1:tab2,d,21,13,db45:tab12,t,11,16,db4" > > output > Data feed: tab1 c 1 3 db1 > Data feed: tab2 d 21 13 db45 > Data feed: ab12 t 11 16 db4 > > my code so far > ~~~~~~~~~~ > while IFS=: read -r field > do > while IFS=, read -r a b c d > do > echo "Data feed: $a $b $c $d" > done <<<"$field" > #IFS=: > done <<<$x > ~~~~~~~~~~ > > so far it is not working and i'm not able to pull data. i don't wanna > use external tool just bash builtin and IFS. any thoughts on how to > fix this? are you allowed to use multiple IFS? btw, I'm using bash 3.x > on Debian Linux server. read will read a line and you have only one line of input so there is nothing to loop over in the outer loop. The other problem you are seeing is that 'field' and 'd' both get set to the remaining words and separators which is not what you want. Also, the inner loop is not really serving any purpose. There a lots of ways to do this, but the one that is closest to your original is probably: echo "$x:" | while read -r -d: field do IFS=, read -r a b c d rest <<<"$field" echo "Data feed: $a $b $c $d" done The -d flag causes the while/read loop to see multiple "lines". The echo adds a terminating separator so that the last "line" is seen. The rest variable in the inner read collects anything left over after the parts you want. -- Ben. |