AWK - input variable to pattern from SHELL -



AWK - input variable to pattern from SHELL -

i extract text file using awk basicly works correctly create dymamical using variable looking pattern.

how should works:

file test_input contains (btw: extract hp dp omnimm -show_locked_devs)

type: device name/id: drive1 pid: 28405 host: host1 type: cartridge name/id: lib1 pid: 28405 host: host1 location: 47 ... get "pid" number drive1 => command find pattern (drive1) , display next line file test_input (28405)

cat test_input | awk 'c&&!--c;/drive1/{c=1}'| awk '{print $2}' 28405

get "location" number => find "pid" numberes , display next 2 line(record) each match utilize grep filter "location" output , display 2nd field (47)

cat test_input | awk 'c&&!--c;/28405/{c=2; print $0}'| grep location | awk '{print $2}' 47

i have noticed double quotes in awk can handle shell variables when utilize same command in script have got error message "awk: statement cannot correctly parsed."

drive=drive1;cat test_input | awk "c&&!--c;/$drive/{c=1}" | awk '{print $2}' 28405

if have hints how work variables shell please allow me know. know commands , redirections complicated yeah not script master :)

if need utilize environment variables can utilize environ awk built-in hash. if want pass arguments awk, can utilize -v option.

an illustration both:

cat >inputfile <<eot aaa bbbxxx xxxccc ddd eot var=xxx awk -vvar="$var" '$0~var {print environ["user"]":"$0}' inputfile

i added creation of sample inputfile.

as know in awk version white space needed between -v , var.

if may suggest utilize ' instead of " around whole script line. makes life bit easier if utilize lot of awk.

output:

myuser:bbbxxx myuser:xxxccc

if understood well, need collect names of devices , locations in non "device" blocks. assume clock starting tag type , tag order same. if not, pls. inform me. based on these assumptions code looks like:

awk '$1=="type:"{dev=$2=="device"} dev && $1=="name/id:"{name=$2} dev && $1=="pid:"{pids[name]=$2} !dev && $1=="pid:"{pid=$2} !dev && $1=="location:"{locs[pid]=$2} end { for(i in pids) { pid = pids[i]; print i"\t"(pid in locs ? locs[pid] : "none"); } } ' inputfile

it fills pids , and locs hash, prints device names found in pids hash , location belongs pid (if found).

output:

drive1 47

of course of study if location after device block, line printed when location found. end part dropped.

shell variables awk scripting

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