grep results with spaces and special chars

Question

I am trying to grab results from lshw and add them to a a bash array so I can create a new string. I am using

lshw -class disk |egrep -A 7 .'-d' |grep 'product' |cut -b 17-

the output looks like this

Samsung SSD 850
Samsung SSD 840
ST8000AS0002-1NA
ST8000AS0002-1NA
Samsung SSD 870
Samsung SSD 870
ST8000VN0022-2EL
Flash Drive FIT
Flash Drive FIT
ST8000AS0002-1NA
ST8000VN0022-2EL
Samsung SSD 870
Samsung SSD 870
ST8000VN004-2M21

I tried to add this output to a bash array but each line with words separated by a space becomes an element in the array. You can also see the results from this command

for w in $(lshw -class disk |egrep -A 7 .'-d' |grep 'product' |cut -b 17-); do printf "$w \n" ;done

output

Samsung
SSD
850
Samsung
SSD
840
ST8000AS0002-1NA
ST8000AS0002-1NA
Samsung
SSD
870
Samsung
SSD
870
ST8000VN0022-2EL
Flash
Drive
FIT
Flash
Drive
FIT
ST8000AS0002-1NA
ST8000VN0022-2EL
Samsung
SSD
870
Samsung
SSD
870
ST8000VN004-2M21

How can I can I keep space separated lines as one one string?

That looks like a pretty fragile way of parsing the output of lshw - I'd suggest using its JSON output format with jq to extract the information, something like lshw -class disk -json | jq -r 'select(.id == "disk") | .product' — steeldriver
– steeldriver, Commented Apr 20, 2022 at 15:24
I don’t understand what result you want. You say “each line with words separated by a space becomes an element in the array” in a context that suggests that that’s what’s happening and it’s not what you want, but you also don’t seem individual words to be elements. Do you want the entire 30-word string to be a single element? If so, why are you trying to use an array? … … … … … … … … Please do not respond in comments; edit your question to make it clearer and more complete. — G-Man Says 'Reinstate Monica'
– G-Man Says 'Reinstate Monica', Commented Apr 21, 2022 at 5:52

frabjous · Accepted Answer · 2022-04-20 15:09:55Z

1

mapfile may be easiest.

mapfile -t myarray < <(lshw -class disk |egrep -A 7 .'-d' |grep 'product' |cut -b 17-)

But if you don't want to use a literal array and just want a loop over the results, you can just do:

lshw -class disk |egrep -A 7 .'-d' |grep 'product' |cut -b 17- | while read w ; do [something with w] ; done

answered Apr 20, 2022 at 15:09

frabjous

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user516667 · Accepted Answer · 2022-04-20 15:02:19Z

0

Quote the command substitution:

# for w in "$(lshw -class disk |egrep -A 7 .'-d' |grep 'product' |cut -b 17-)"; do printf "$w \n" ;done
USB3.0 DISK00               
USB3.0 DISK01
USB3.0 DISK02
MS/MS-Pro
SD/MMC
Compact Flash
SM/xD-Picture
ST1000DM003-1CH1
WDC WD20EZAZ-00G

You then get: "USB3.0 DISK00" "USB3.0 DISK01" ... being passed into the for loop.

answered Apr 20, 2022 at 15:02

user516667

1

That actually passes everything as a single multi-line string I think? See for example bash pitfall #1

steeldriver
– steeldriver

2022-04-20 17:56:12 +00:00
Commented Apr 20, 2022 at 17:56
I'll be honest, I'd have never set it up that way, I just supplied a fix. It works, as the example shows. I haven't done any debugging though and it may be a one multi-line string rather that a number of discrete lines. If I was doing for myself I'd pipe the output from the lshw into AWK and deal with it there, but then I'm old-fashioned! Frabjous' second example is a better solution.

user516667
– user516667

2022-04-20 19:36:08 +00:00
Commented Apr 20, 2022 at 19:36

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