How can I read each line from a file into one variable for the last field, and another variable for the other fields?
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1
down vote
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How can I read a line from a file into two variables: one variable for the last field, and the the other variable for the other fields?
For example, I have a file:
hello world! 10s
It is a good day. 4m
...
I would like to read each line into two variables: one variable contains the time interval at the end of the line, and the other variable contains the fields before it. I was wondering how to do it; this is as far as I have gotten:
while read line
do
... # split $line into $message and $interval
myprogram "$message" "$interval"
done < "$inputfile"
bash text-processing
edited 4 mins ago
K7AAY
236319
asked 8 hours ago
Tim
24.7k70239429
 |Â
show 2 more comments
up vote
1
down vote
favorite
How can I read a line from a file into two variables: one variable for the last field, and the the other variable for the other fields?
For example, I have a file:
hello world! 10s
It is a good day. 4m
...
I would like to read each line into two variables: one variable contains the time interval at the end of the line, and the other variable contains the fields before it. I was wondering how to do it; this is as far as I have gotten:
while read line
do
... # split $line into $message and $interval
myprogram "$message" "$interval"
done < "$inputfile"
bash text-processing
edited 4 mins ago
K7AAY
236319
asked 8 hours ago
Tim
24.7k70239429
Will the interval ever contain white space?
– Jesse_b
7 hours ago
Thanks. The time interval will be used as argument tosleep. Ifsleepaccepts an argument with a space within it, then yes; otherwise, no.
– Tim
7 hours ago
Obligatory unix.stackexchange.com/q/169716/117549
– Jeff Schaller
7 hours ago
@JeffSchaller Could you tell me how I should rewrite my while loop? I have looked at the link
– Tim
6 hours ago
It's apparent that reading into variables is not your final destination; there might be other/better ways to accomplish your goal, if we knew what it was.
– Jeff Schaller
6 hours ago
 |Â
show 2 more comments
up vote
1
down vote
favorite
up vote
1
down vote
favorite
How can I read a line from a file into two variables: one variable for the last field, and the the other variable for the other fields?
For example, I have a file:
hello world! 10s
It is a good day. 4m
...
I would like to read each line into two variables: one variable contains the time interval at the end of the line, and the other variable contains the fields before it. I was wondering how to do it; this is as far as I have gotten:
while read line
do
... # split $line into $message and $interval
myprogram "$message" "$interval"
done < "$inputfile"
bash text-processing
edited 4 mins ago
K7AAY
236319
asked 8 hours ago
Tim
24.7k70239429
How can I read a line from a file into two variables: one variable for the last field, and the the other variable for the other fields?
For example, I have a file:
hello world! 10s
It is a good day. 4m
...
I would like to read each line into two variables: one variable contains the time interval at the end of the line, and the other variable contains the fields before it. I was wondering how to do it; this is as far as I have gotten:
while read line
do
... # split $line into $message and $interval
myprogram "$message" "$interval"
done < "$inputfile"
bash text-processing
bash text-processing
edited 4 mins ago
K7AAY
236319
asked 8 hours ago
Tim
24.7k70239429
edited 4 mins ago
K7AAY
236319
asked 8 hours ago
Tim
24.7k70239429
edited 4 mins ago
K7AAY
236319
edited 4 mins ago
K7AAY
236319
edited 4 mins ago
K7AAY
236319
236319
asked 8 hours ago
Tim
24.7k70239429
asked 8 hours ago
Tim
24.7k70239429
asked 8 hours ago
Tim
24.7k70239429
24.7k70239429
Will the interval ever contain white space?
– Jesse_b
7 hours ago
Thanks. The time interval will be used as argument tosleep. Ifsleepaccepts an argument with a space within it, then yes; otherwise, no.
– Tim
7 hours ago
Obligatory unix.stackexchange.com/q/169716/117549
– Jeff Schaller
7 hours ago
@JeffSchaller Could you tell me how I should rewrite my while loop? I have looked at the link
– Tim
6 hours ago
It's apparent that reading into variables is not your final destination; there might be other/better ways to accomplish your goal, if we knew what it was.
– Jeff Schaller
6 hours ago
 |Â
show 2 more comments
Will the interval ever contain white space?
– Jesse_b
7 hours ago
Thanks. The time interval will be used as argument tosleep. Ifsleepaccepts an argument with a space within it, then yes; otherwise, no.
– Tim
7 hours ago
Obligatory unix.stackexchange.com/q/169716/117549
– Jeff Schaller
7 hours ago
@JeffSchaller Could you tell me how I should rewrite my while loop? I have looked at the link
– Tim
6 hours ago
It's apparent that reading into variables is not your final destination; there might be other/better ways to accomplish your goal, if we knew what it was.
– Jeff Schaller
6 hours ago
Will the interval ever contain white space?
– Jesse_b
7 hours ago
Will the interval ever contain white space?
– Jesse_b
7 hours ago
Thanks. The time interval will be used as argument to
sleep. If sleep accepts an argument with a space within it, then yes; otherwise, no.– Tim
7 hours ago
Thanks. The time interval will be used as argument to
sleep. If sleep accepts an argument with a space within it, then yes; otherwise, no.– Tim
7 hours ago
Obligatory unix.stackexchange.com/q/169716/117549
– Jeff Schaller
7 hours ago
Obligatory unix.stackexchange.com/q/169716/117549
– Jeff Schaller
7 hours ago
@JeffSchaller Could you tell me how I should rewrite my while loop? I have looked at the link
– Tim
6 hours ago
@JeffSchaller Could you tell me how I should rewrite my while loop? I have looked at the link
– Tim
6 hours ago
It's apparent that reading into variables is not your final destination; there might be other/better ways to accomplish your goal, if we knew what it was.
– Jeff Schaller
6 hours ago
It's apparent that reading into variables is not your final destination; there might be other/better ways to accomplish your goal, if we knew what it was.
– Jeff Schaller
6 hours ago
 |Â
show 2 more comments
1 Answer
1
active
oldest
votes
up vote
3
down vote
accepted
As long as the interval contains no whitespace this should work:
#!/bin/bash
input=/path/to/input
while read -r line; do
message=$line% *
interval=$line##*
echo "$message"
sleep "$interval"
done < "$input"
$line% * Will strip everything after the last space character
$line##* Will strip everything before the last space character
answered 7 hours ago
Jesse_b
10.6k22661
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
accepted
As long as the interval contains no whitespace this should work:
#!/bin/bash
input=/path/to/input
while read -r line; do
message=$line% *
interval=$line##*
echo "$message"
sleep "$interval"
done < "$input"
$line% * Will strip everything after the last space character
$line##* Will strip everything before the last space character
answered 7 hours ago
Jesse_b
10.6k22661
add a comment |Â
up vote
3
down vote
accepted
As long as the interval contains no whitespace this should work:
#!/bin/bash
input=/path/to/input
while read -r line; do
message=$line% *
interval=$line##*
echo "$message"
sleep "$interval"
done < "$input"
$line% * Will strip everything after the last space character
$line##* Will strip everything before the last space character
answered 7 hours ago
Jesse_b
10.6k22661
add a comment |Â
up vote
3
down vote
accepted
up vote
3
down vote
accepted
As long as the interval contains no whitespace this should work:
#!/bin/bash
input=/path/to/input
while read -r line; do
message=$line% *
interval=$line##*
echo "$message"
sleep "$interval"
done < "$input"
$line% * Will strip everything after the last space character
$line##* Will strip everything before the last space character
answered 7 hours ago
Jesse_b
10.6k22661
As long as the interval contains no whitespace this should work:
#!/bin/bash
input=/path/to/input
while read -r line; do
message=$line% *
interval=$line##*
echo "$message"
sleep "$interval"
done < "$input"
$line% * Will strip everything after the last space character
$line##* Will strip everything before the last space character
answered 7 hours ago
Jesse_b
10.6k22661
answered 7 hours ago
Jesse_b
10.6k22661
answered 7 hours ago
Jesse_b
10.6k22661
answered 7 hours ago
Jesse_b
10.6k22661
10.6k22661
add a comment |Â
add a comment |Â
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Will the interval ever contain white space?
– Jesse_b
7 hours ago
Thanks. The time interval will be used as argument to
sleep. Ifsleepaccepts an argument with a space within it, then yes; otherwise, no.– Tim
7 hours ago
Obligatory unix.stackexchange.com/q/169716/117549
– Jeff Schaller
7 hours ago
@JeffSchaller Could you tell me how I should rewrite my while loop? I have looked at the link
– Tim
6 hours ago
It's apparent that reading into variables is not your final destination; there might be other/better ways to accomplish your goal, if we knew what it was.
– Jeff Schaller
6 hours ago