Read value from specific row and column
I have csv file in this format:
1 value1
2 value2
3 value3
I can also define it like this (if it is more convenient)
column1,column2
1,value1
2,value2
3,value3
I should write a shell script in order to match value from the first column and take value from that row from the second column value.
So for example, I have variable var
If var is equal to 1 then take and use (or print) value1.
If value is 2 take value2 and so on.
Number of rows is limited to 5.
Is this possible?
Thanks
linux bash shell centos sh
edited Nov 12 '18 at 23:47
codeforester
17.5k83964
asked Nov 12 '18 at 23:11
DejanDejan
57082148
|
show 1 more comment
I have csv file in this format:
1 value1
2 value2
3 value3
I can also define it like this (if it is more convenient)
column1,column2
1,value1
2,value2
3,value3
I should write a shell script in order to match value from the first column and take value from that row from the second column value.
So for example, I have variable var
If var is equal to 1 then take and use (or print) value1.
If value is 2 take value2 and so on.
Number of rows is limited to 5.
Is this possible?
Thanks
linux bash shell centos sh
edited Nov 12 '18 at 23:47
codeforester
17.5k83964
asked Nov 12 '18 at 23:11
DejanDejan
57082148
2
use grep and cut like so:var=1 ; grep "^${var}" yourfile.txt | cut -d',' -f2
– Red Cricket
Nov 12 '18 at 23:15
Hi Red. For what purposes is this used "^1"? how to match with my variable which will be read within the script? Thanks
– Dejan
Nov 12 '18 at 23:17
the^mean match the start of a line. So^1means match line that starts with 1
– Red Cricket
Nov 12 '18 at 23:18
Hi Red. but what if my value2 for example is something like this "1.1.1". Does it mean if I grep it with value "1" it will grep me the frst row (because of the first row first column value) but also and second row (because it is similar to second row second column value )? thanks
– Dejan
Nov 12 '18 at 23:20
try it and see.
– Red Cricket
Nov 12 '18 at 23:21
|
show 1 more comment
I have csv file in this format:
1 value1
2 value2
3 value3
I can also define it like this (if it is more convenient)
column1,column2
1,value1
2,value2
3,value3
I should write a shell script in order to match value from the first column and take value from that row from the second column value.
So for example, I have variable var
If var is equal to 1 then take and use (or print) value1.
If value is 2 take value2 and so on.
Number of rows is limited to 5.
Is this possible?
Thanks
linux bash shell centos sh
edited Nov 12 '18 at 23:47
codeforester
17.5k83964
asked Nov 12 '18 at 23:11
DejanDejan
57082148
I have csv file in this format:
1 value1
2 value2
3 value3
I can also define it like this (if it is more convenient)
column1,column2
1,value1
2,value2
3,value3
I should write a shell script in order to match value from the first column and take value from that row from the second column value.
So for example, I have variable var
If var is equal to 1 then take and use (or print) value1.
If value is 2 take value2 and so on.
Number of rows is limited to 5.
Is this possible?
Thanks
linux bash shell centos sh
linux bash shell centos sh
edited Nov 12 '18 at 23:47
codeforester
17.5k83964
asked Nov 12 '18 at 23:11
DejanDejan
57082148
edited Nov 12 '18 at 23:47
codeforester
17.5k83964
asked Nov 12 '18 at 23:11
DejanDejan
57082148
edited Nov 12 '18 at 23:47
codeforester
17.5k83964
edited Nov 12 '18 at 23:47
codeforester
17.5k83964
edited Nov 12 '18 at 23:47
codeforester
17.5k83964
17.5k83964
asked Nov 12 '18 at 23:11
DejanDejan
57082148
asked Nov 12 '18 at 23:11
DejanDejan
57082148
asked Nov 12 '18 at 23:11
DejanDejan
57082148
57082148
2
use grep and cut like so:var=1 ; grep "^${var}" yourfile.txt | cut -d',' -f2
– Red Cricket
Nov 12 '18 at 23:15
Hi Red. For what purposes is this used "^1"? how to match with my variable which will be read within the script? Thanks
– Dejan
Nov 12 '18 at 23:17
the^mean match the start of a line. So^1means match line that starts with 1
– Red Cricket
Nov 12 '18 at 23:18
Hi Red. but what if my value2 for example is something like this "1.1.1". Does it mean if I grep it with value "1" it will grep me the frst row (because of the first row first column value) but also and second row (because it is similar to second row second column value )? thanks
– Dejan
Nov 12 '18 at 23:20
try it and see.
– Red Cricket
Nov 12 '18 at 23:21
|
show 1 more comment
2
use grep and cut like so:var=1 ; grep "^${var}" yourfile.txt | cut -d',' -f2
– Red Cricket
Nov 12 '18 at 23:15
Hi Red. For what purposes is this used "^1"? how to match with my variable which will be read within the script? Thanks
– Dejan
Nov 12 '18 at 23:17
the^mean match the start of a line. So^1means match line that starts with 1
– Red Cricket
Nov 12 '18 at 23:18
Hi Red. but what if my value2 for example is something like this "1.1.1". Does it mean if I grep it with value "1" it will grep me the frst row (because of the first row first column value) but also and second row (because it is similar to second row second column value )? thanks
– Dejan
Nov 12 '18 at 23:20
try it and see.
– Red Cricket
Nov 12 '18 at 23:21
2
2
use grep and cut like so:
var=1 ; grep "^${var}" yourfile.txt | cut -d',' -f2– Red Cricket
Nov 12 '18 at 23:15
use grep and cut like so:
var=1 ; grep "^${var}" yourfile.txt | cut -d',' -f2– Red Cricket
Nov 12 '18 at 23:15
Hi Red. For what purposes is this used "^1"? how to match with my variable which will be read within the script? Thanks
– Dejan
Nov 12 '18 at 23:17
Hi Red. For what purposes is this used "^1"? how to match with my variable which will be read within the script? Thanks
– Dejan
Nov 12 '18 at 23:17
the
^ mean match the start of a line. So ^1 means match line that starts with 1– Red Cricket
Nov 12 '18 at 23:18
the
^ mean match the start of a line. So ^1 means match line that starts with 1– Red Cricket
Nov 12 '18 at 23:18
Hi Red. but what if my value2 for example is something like this "1.1.1". Does it mean if I grep it with value "1" it will grep me the frst row (because of the first row first column value) but also and second row (because it is similar to second row second column value )? thanks
– Dejan
Nov 12 '18 at 23:20
Hi Red. but what if my value2 for example is something like this "1.1.1". Does it mean if I grep it with value "1" it will grep me the frst row (because of the first row first column value) but also and second row (because it is similar to second row second column value )? thanks
– Dejan
Nov 12 '18 at 23:20
try it and see.
– Red Cricket
Nov 12 '18 at 23:21
try it and see.
– Red Cricket
Nov 12 '18 at 23:21
|
show 1 more comment
1 Answer
1
active
oldest
votes
Awk is your friend here:
$ cat input.txt
1 value1
2 value2
3 value3
$ awk -v key=1 '$1 == key { print $2 }' input.txt
value1
$ awk -v key=2 '$1 == key { print $2 }' input.txt
value2
etc. Just replace the key=1 with key=$var.
answered Nov 12 '18 at 23:36
ShawnShawn
3,5981613
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Awk is your friend here:
$ cat input.txt
1 value1
2 value2
3 value3
$ awk -v key=1 '$1 == key { print $2 }' input.txt
value1
$ awk -v key=2 '$1 == key { print $2 }' input.txt
value2
etc. Just replace the key=1 with key=$var.
answered Nov 12 '18 at 23:36
ShawnShawn
3,5981613
add a comment |
Awk is your friend here:
$ cat input.txt
1 value1
2 value2
3 value3
$ awk -v key=1 '$1 == key { print $2 }' input.txt
value1
$ awk -v key=2 '$1 == key { print $2 }' input.txt
value2
etc. Just replace the key=1 with key=$var.
answered Nov 12 '18 at 23:36
ShawnShawn
3,5981613
add a comment |
Awk is your friend here:
$ cat input.txt
1 value1
2 value2
3 value3
$ awk -v key=1 '$1 == key { print $2 }' input.txt
value1
$ awk -v key=2 '$1 == key { print $2 }' input.txt
value2
etc. Just replace the key=1 with key=$var.
answered Nov 12 '18 at 23:36
ShawnShawn
3,5981613
Awk is your friend here:
$ cat input.txt
1 value1
2 value2
3 value3
$ awk -v key=1 '$1 == key { print $2 }' input.txt
value1
$ awk -v key=2 '$1 == key { print $2 }' input.txt
value2
etc. Just replace the key=1 with key=$var.
answered Nov 12 '18 at 23:36
ShawnShawn
3,5981613
answered Nov 12 '18 at 23:36
ShawnShawn
3,5981613
answered Nov 12 '18 at 23:36
ShawnShawn
3,5981613
answered Nov 12 '18 at 23:36
ShawnShawn
3,5981613
3,5981613
add a comment |
add a comment |
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2
use grep and cut like so:
var=1 ; grep "^${var}" yourfile.txt | cut -d',' -f2– Red Cricket
Nov 12 '18 at 23:15
Hi Red. For what purposes is this used "^1"? how to match with my variable which will be read within the script? Thanks
– Dejan
Nov 12 '18 at 23:17
the
^mean match the start of a line. So^1means match line that starts with 1– Red Cricket
Nov 12 '18 at 23:18
Hi Red. but what if my value2 for example is something like this "1.1.1". Does it mean if I grep it with value "1" it will grep me the frst row (because of the first row first column value) but also and second row (because it is similar to second row second column value )? thanks
– Dejan
Nov 12 '18 at 23:20
try it and see.
– Red Cricket
Nov 12 '18 at 23:21