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Bash grep result from command whole line
how to execute lines coming from a grep result?Peculiar piping grep/head behaviorHow to use the grep result in command line?Bash : compare two strings with spaceGrep from a line to a linelimit grep context to a part of the result lineFor a large directory, create a variable of the filenames which include lines which include the text string stored in another variablegrep and output whole wordIssues with using multiple * in the grep commandHow to download a web page content to a text file exactly as the web page is?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
I have a script where I want to list usbs, using the command lsblk.
The command:
$ lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb
which results in
sdb usb Kingston DataTraveler 2.0
sdc usb Kingston DT 101 G2
So I want to save the result in a variable to work later, I write
$ usbs=$(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb)
What I was expecting is that the variable usbs stores the result in two whole lines like above. But if I run
for i in $usbs[@]; do
echo $i
done
I get the result split into words:
sdb
usb
Kingston
DataTraveler
2.0
sdc
usb
Kingston
DT
101
G2
Question:
Is there a way in wich, using the grep command, I can store the result of the command like two whole lines?
Note:
I prefer to know if there's a simple solution instead of dumping the result in a file and then read it.
bash grep lsblk
asked 3 hours ago
guillermo chamorroguillermo chamorro
1093
New contributor
guillermo chamorro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have a script where I want to list usbs, using the command lsblk.
The command:
$ lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb
which results in
sdb usb Kingston DataTraveler 2.0
sdc usb Kingston DT 101 G2
So I want to save the result in a variable to work later, I write
$ usbs=$(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb)
What I was expecting is that the variable usbs stores the result in two whole lines like above. But if I run
for i in $usbs[@]; do
echo $i
done
I get the result split into words:
sdb
usb
Kingston
DataTraveler
2.0
sdc
usb
Kingston
DT
101
G2
Question:
Is there a way in wich, using the grep command, I can store the result of the command like two whole lines?
Note:
I prefer to know if there's a simple solution instead of dumping the result in a file and then read it.
bash grep lsblk
asked 3 hours ago
guillermo chamorroguillermo chamorro
1093
New contributor
guillermo chamorro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
Tryecho "$#usbs[@]"to see the number of items in theusbs"array", or"$!usbs[@]"to list its indices. Or print it withecho "$usbs". It is likely storing what you are expecting it to.
– fra-san
2 hours ago
1
Double-quote your variables (and$(...)constructs) when you reference them and the shell will keep your whitespace intact. But be aware the shell won't automatically assign array elements based on newlines. It will still be one string, just with a newline in the middle.
– roaima
2 hours ago
@Christopher I like your solution but gave me a headache :), because subsecuents comands use the IFS set before... it took me some time to figure what was happening, it does it silently.
– guillermo chamorro
1 hour ago
var=$(...)is equivalent tovar="$(...)"
– Jesse_b
23 mins ago
add a comment |
I have a script where I want to list usbs, using the command lsblk.
The command:
$ lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb
which results in
sdb usb Kingston DataTraveler 2.0
sdc usb Kingston DT 101 G2
So I want to save the result in a variable to work later, I write
$ usbs=$(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb)
What I was expecting is that the variable usbs stores the result in two whole lines like above. But if I run
for i in $usbs[@]; do
echo $i
done
I get the result split into words:
sdb
usb
Kingston
DataTraveler
2.0
sdc
usb
Kingston
DT
101
G2
Question:
Is there a way in wich, using the grep command, I can store the result of the command like two whole lines?
Note:
I prefer to know if there's a simple solution instead of dumping the result in a file and then read it.
bash grep lsblk
asked 3 hours ago
guillermo chamorroguillermo chamorro
1093
New contributor
guillermo chamorro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a script where I want to list usbs, using the command lsblk.
The command:
$ lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb
which results in
sdb usb Kingston DataTraveler 2.0
sdc usb Kingston DT 101 G2
So I want to save the result in a variable to work later, I write
$ usbs=$(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb)
What I was expecting is that the variable usbs stores the result in two whole lines like above. But if I run
for i in $usbs[@]; do
echo $i
done
I get the result split into words:
sdb
usb
Kingston
DataTraveler
2.0
sdc
usb
Kingston
DT
101
G2
Question:
Is there a way in wich, using the grep command, I can store the result of the command like two whole lines?
Note:
I prefer to know if there's a simple solution instead of dumping the result in a file and then read it.
bash grep lsblk
bash grep lsblk
asked 3 hours ago
guillermo chamorroguillermo chamorro
1093
New contributor
guillermo chamorro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
guillermo chamorroguillermo chamorro
1093
New contributor
guillermo chamorro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
guillermo chamorroguillermo chamorro
1093
New contributor
guillermo chamorro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
guillermo chamorroguillermo chamorro
1093
asked 3 hours ago
guillermo chamorroguillermo chamorro
1093
1093
New contributor
guillermo chamorro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
guillermo chamorro is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
Tryecho "$#usbs[@]"to see the number of items in theusbs"array", or"$!usbs[@]"to list its indices. Or print it withecho "$usbs". It is likely storing what you are expecting it to.
– fra-san
2 hours ago
1
Double-quote your variables (and$(...)constructs) when you reference them and the shell will keep your whitespace intact. But be aware the shell won't automatically assign array elements based on newlines. It will still be one string, just with a newline in the middle.
– roaima
2 hours ago
@Christopher I like your solution but gave me a headache :), because subsecuents comands use the IFS set before... it took me some time to figure what was happening, it does it silently.
– guillermo chamorro
1 hour ago
var=$(...)is equivalent tovar="$(...)"
– Jesse_b
23 mins ago
add a comment |
1
Tryecho "$#usbs[@]"to see the number of items in theusbs"array", or"$!usbs[@]"to list its indices. Or print it withecho "$usbs". It is likely storing what you are expecting it to.
– fra-san
2 hours ago
1
Double-quote your variables (and$(...)constructs) when you reference them and the shell will keep your whitespace intact. But be aware the shell won't automatically assign array elements based on newlines. It will still be one string, just with a newline in the middle.
– roaima
2 hours ago
@Christopher I like your solution but gave me a headache :), because subsecuents comands use the IFS set before... it took me some time to figure what was happening, it does it silently.
– guillermo chamorro
1 hour ago
var=$(...)is equivalent tovar="$(...)"
– Jesse_b
23 mins ago
1
1
Try
echo "$#usbs[@]" to see the number of items in the usbs "array", or "$!usbs[@]" to list its indices. Or print it with echo "$usbs". It is likely storing what you are expecting it to.– fra-san
2 hours ago
Try
echo "$#usbs[@]" to see the number of items in the usbs "array", or "$!usbs[@]" to list its indices. Or print it with echo "$usbs". It is likely storing what you are expecting it to.– fra-san
2 hours ago
1
1
Double-quote your variables (and
$(...) constructs) when you reference them and the shell will keep your whitespace intact. But be aware the shell won't automatically assign array elements based on newlines. It will still be one string, just with a newline in the middle.– roaima
2 hours ago
Double-quote your variables (and
$(...) constructs) when you reference them and the shell will keep your whitespace intact. But be aware the shell won't automatically assign array elements based on newlines. It will still be one string, just with a newline in the middle.– roaima
2 hours ago
@Christopher I like your solution but gave me a headache :), because subsecuents comands use the IFS set before... it took me some time to figure what was happening, it does it silently.
– guillermo chamorro
1 hour ago
@Christopher I like your solution but gave me a headache :), because subsecuents comands use the IFS set before... it took me some time to figure what was happening, it does it silently.
– guillermo chamorro
1 hour ago
var=$(...) is equivalent to var="$(...)"– Jesse_b
23 mins ago
var=$(...) is equivalent to var="$(...)"– Jesse_b
23 mins ago
add a comment |
1 Answer
1
active
oldest
votes
This is a good situation to use readarray/mapfile:
readarray -t usbs < <(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb)
This will create an array with your output where each line is separated into it's own element.
In your case it would make an array like:
usbs=(
'sdb usb Kingston DataTraveler 2.0'
'sdc usb Kingston DT 101 G2'
)
As is you are assigning your entire output to a single variable (not an array) which essentially does this:
usbs='sdb usb Kingston DataTraveler 2.0
sdc usb Kingston DT 101 G2 '
In order to make it an array you would do:
usbs=($(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb))
but this would make each word separated by whitespace into its own element, equivalent to:
usbs=(
sdb
usb
Kingston
DataTraveler
2.0
sdc
usb
Kingston
DT
101
G2
)
answered 3 hours ago
Jesse_bJesse_b
15.2k33574
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
This is a good situation to use readarray/mapfile:
readarray -t usbs < <(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb)
This will create an array with your output where each line is separated into it's own element.
In your case it would make an array like:
usbs=(
'sdb usb Kingston DataTraveler 2.0'
'sdc usb Kingston DT 101 G2'
)
As is you are assigning your entire output to a single variable (not an array) which essentially does this:
usbs='sdb usb Kingston DataTraveler 2.0
sdc usb Kingston DT 101 G2 '
In order to make it an array you would do:
usbs=($(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb))
but this would make each word separated by whitespace into its own element, equivalent to:
usbs=(
sdb
usb
Kingston
DataTraveler
2.0
sdc
usb
Kingston
DT
101
G2
)
answered 3 hours ago
Jesse_bJesse_b
15.2k33574
add a comment |
This is a good situation to use readarray/mapfile:
readarray -t usbs < <(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb)
This will create an array with your output where each line is separated into it's own element.
In your case it would make an array like:
usbs=(
'sdb usb Kingston DataTraveler 2.0'
'sdc usb Kingston DT 101 G2'
)
As is you are assigning your entire output to a single variable (not an array) which essentially does this:
usbs='sdb usb Kingston DataTraveler 2.0
sdc usb Kingston DT 101 G2 '
In order to make it an array you would do:
usbs=($(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb))
but this would make each word separated by whitespace into its own element, equivalent to:
usbs=(
sdb
usb
Kingston
DataTraveler
2.0
sdc
usb
Kingston
DT
101
G2
)
answered 3 hours ago
Jesse_bJesse_b
15.2k33574
add a comment |
This is a good situation to use readarray/mapfile:
readarray -t usbs < <(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb)
This will create an array with your output where each line is separated into it's own element.
In your case it would make an array like:
usbs=(
'sdb usb Kingston DataTraveler 2.0'
'sdc usb Kingston DT 101 G2'
)
As is you are assigning your entire output to a single variable (not an array) which essentially does this:
usbs='sdb usb Kingston DataTraveler 2.0
sdc usb Kingston DT 101 G2 '
In order to make it an array you would do:
usbs=($(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb))
but this would make each word separated by whitespace into its own element, equivalent to:
usbs=(
sdb
usb
Kingston
DataTraveler
2.0
sdc
usb
Kingston
DT
101
G2
)
answered 3 hours ago
Jesse_bJesse_b
15.2k33574
This is a good situation to use readarray/mapfile:
readarray -t usbs < <(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb)
This will create an array with your output where each line is separated into it's own element.
In your case it would make an array like:
usbs=(
'sdb usb Kingston DataTraveler 2.0'
'sdc usb Kingston DT 101 G2'
)
As is you are assigning your entire output to a single variable (not an array) which essentially does this:
usbs='sdb usb Kingston DataTraveler 2.0
sdc usb Kingston DT 101 G2 '
In order to make it an array you would do:
usbs=($(lsblk -o NAME,TRAN,VENDOR,MODEL | grep usb))
but this would make each word separated by whitespace into its own element, equivalent to:
usbs=(
sdb
usb
Kingston
DataTraveler
2.0
sdc
usb
Kingston
DT
101
G2
)
answered 3 hours ago
Jesse_bJesse_b
15.2k33574
answered 3 hours ago
Jesse_bJesse_b
15.2k33574
answered 3 hours ago
Jesse_bJesse_b
15.2k33574
answered 3 hours ago
Jesse_bJesse_b
15.2k33574
15.2k33574
add a comment |
add a comment |
guillermo chamorro is a new contributor. Be nice, and check out our Code of Conduct.
guillermo chamorro is a new contributor. Be nice, and check out our Code of Conduct.
guillermo chamorro is a new contributor. Be nice, and check out our Code of Conduct.
guillermo chamorro is a new contributor. Be nice, and check out our Code of Conduct.
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1
Try
echo "$#usbs[@]"to see the number of items in theusbs"array", or"$!usbs[@]"to list its indices. Or print it withecho "$usbs". It is likely storing what you are expecting it to.– fra-san
2 hours ago
1
Double-quote your variables (and
$(...)constructs) when you reference them and the shell will keep your whitespace intact. But be aware the shell won't automatically assign array elements based on newlines. It will still be one string, just with a newline in the middle.– roaima
2 hours ago
@Christopher I like your solution but gave me a headache :), because subsecuents comands use the IFS set before... it took me some time to figure what was happening, it does it silently.
– guillermo chamorro
1 hour ago
var=$(...)is equivalent tovar="$(...)"– Jesse_b
23 mins ago