How can I create an array from the first line of multiple text sources?
I have an array of paths to files which each have several lines of text. I'd like to produce an array that is populated with the first line of each file processed like so:
# this.txt first line is [Test this]
# another.txt first line is [Test another]
paths=(
./this/path/this.txt
./another/path/another.txt
)
for i in ${paths[@]}; do
read -r line < $i
lines+=$line
done
At most I've only gotten one value in my array. I can't seem to get the array I'm looking for out of the for loop. I've tried many variations and having a hard time figuring out where I'm going wrong.
bash shell-script array
asked 7 mins ago
dimmechdimmech
214413
add a comment |
I have an array of paths to files which each have several lines of text. I'd like to produce an array that is populated with the first line of each file processed like so:
# this.txt first line is [Test this]
# another.txt first line is [Test another]
paths=(
./this/path/this.txt
./another/path/another.txt
)
for i in ${paths[@]}; do
read -r line < $i
lines+=$line
done
At most I've only gotten one value in my array. I can't seem to get the array I'm looking for out of the for loop. I've tried many variations and having a hard time figuring out where I'm going wrong.
bash shell-script array
asked 7 mins ago
dimmechdimmech
214413
add a comment |
I have an array of paths to files which each have several lines of text. I'd like to produce an array that is populated with the first line of each file processed like so:
# this.txt first line is [Test this]
# another.txt first line is [Test another]
paths=(
./this/path/this.txt
./another/path/another.txt
)
for i in ${paths[@]}; do
read -r line < $i
lines+=$line
done
At most I've only gotten one value in my array. I can't seem to get the array I'm looking for out of the for loop. I've tried many variations and having a hard time figuring out where I'm going wrong.
bash shell-script array
asked 7 mins ago
dimmechdimmech
214413
I have an array of paths to files which each have several lines of text. I'd like to produce an array that is populated with the first line of each file processed like so:
# this.txt first line is [Test this]
# another.txt first line is [Test another]
paths=(
./this/path/this.txt
./another/path/another.txt
)
for i in ${paths[@]}; do
read -r line < $i
lines+=$line
done
At most I've only gotten one value in my array. I can't seem to get the array I'm looking for out of the for loop. I've tried many variations and having a hard time figuring out where I'm going wrong.
bash shell-script array
bash shell-script array
asked 7 mins ago
dimmechdimmech
214413
asked 7 mins ago
dimmechdimmech
214413
asked 7 mins ago
dimmechdimmech
214413
asked 7 mins ago
dimmechdimmech
214413
asked 7 mins ago
dimmechdimmech
214413
214413
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
You wanted
lines+=("$line")
+=WORD is string concatenation (or addition). A compound assignment +=(...) appends the values to the array.
You probably also want to quote all your variable expansions here - the line definitely needs it if the line might contain whitespace, but you could have issues elsewhere as well.
answered 46 secs ago
Michael HomerMichael Homer
47.7k8125165
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You wanted
lines+=("$line")
+=WORD is string concatenation (or addition). A compound assignment +=(...) appends the values to the array.
You probably also want to quote all your variable expansions here - the line definitely needs it if the line might contain whitespace, but you could have issues elsewhere as well.
answered 46 secs ago
Michael HomerMichael Homer
47.7k8125165
add a comment |
You wanted
lines+=("$line")
+=WORD is string concatenation (or addition). A compound assignment +=(...) appends the values to the array.
You probably also want to quote all your variable expansions here - the line definitely needs it if the line might contain whitespace, but you could have issues elsewhere as well.
answered 46 secs ago
Michael HomerMichael Homer
47.7k8125165
add a comment |
You wanted
lines+=("$line")
+=WORD is string concatenation (or addition). A compound assignment +=(...) appends the values to the array.
You probably also want to quote all your variable expansions here - the line definitely needs it if the line might contain whitespace, but you could have issues elsewhere as well.
answered 46 secs ago
Michael HomerMichael Homer
47.7k8125165
You wanted
lines+=("$line")
+=WORD is string concatenation (or addition). A compound assignment +=(...) appends the values to the array.
You probably also want to quote all your variable expansions here - the line definitely needs it if the line might contain whitespace, but you could have issues elsewhere as well.
answered 46 secs ago
Michael HomerMichael Homer
47.7k8125165
answered 46 secs ago
Michael HomerMichael Homer
47.7k8125165
answered 46 secs ago
Michael HomerMichael Homer
47.7k8125165
answered 46 secs ago
Michael HomerMichael Homer
47.7k8125165
47.7k8125165
add a comment |
add a comment |
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