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How can I read user input as an array in Bash?
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How could I read user input as an array? :)
command-line bash
edited Mar 6 '11 at 8:07
Stefano Palazzo♦
63.6k33183216
asked Mar 6 '11 at 7:06
moata_umoata_u
1,48392026
add a comment |
How could I read user input as an array? :)
command-line bash
edited Mar 6 '11 at 8:07
Stefano Palazzo♦
63.6k33183216
asked Mar 6 '11 at 7:06
moata_umoata_u
1,48392026
I'm presuming you want to read from stdin? My answer will also work with execution likecat war_and_peace.txt | ./array_test.sh.
– Stefano Palazzo♦
Mar 6 '11 at 7:48
Or simply./array_test.sh < war_and_peace.txt.
– Eliah Kagan
May 11 '15 at 18:13
add a comment |
How could I read user input as an array? :)
command-line bash
edited Mar 6 '11 at 8:07
Stefano Palazzo♦
63.6k33183216
asked Mar 6 '11 at 7:06
moata_umoata_u
1,48392026
How could I read user input as an array? :)
command-line bash
command-line bash
edited Mar 6 '11 at 8:07
Stefano Palazzo♦
63.6k33183216
asked Mar 6 '11 at 7:06
moata_umoata_u
1,48392026
edited Mar 6 '11 at 8:07
Stefano Palazzo♦
63.6k33183216
asked Mar 6 '11 at 7:06
moata_umoata_u
1,48392026
edited Mar 6 '11 at 8:07
Stefano Palazzo♦
63.6k33183216
edited Mar 6 '11 at 8:07
Stefano Palazzo♦
63.6k33183216
edited Mar 6 '11 at 8:07
Stefano Palazzo♦
63.6k33183216
63.6k33183216
asked Mar 6 '11 at 7:06
moata_umoata_u
1,48392026
asked Mar 6 '11 at 7:06
moata_umoata_u
1,48392026
asked Mar 6 '11 at 7:06
moata_umoata_u
1,48392026
1,48392026
I'm presuming you want to read from stdin? My answer will also work with execution likecat war_and_peace.txt | ./array_test.sh.
– Stefano Palazzo♦
Mar 6 '11 at 7:48
Or simply./array_test.sh < war_and_peace.txt.
– Eliah Kagan
May 11 '15 at 18:13
add a comment |
I'm presuming you want to read from stdin? My answer will also work with execution likecat war_and_peace.txt | ./array_test.sh.
– Stefano Palazzo♦
Mar 6 '11 at 7:48
Or simply./array_test.sh < war_and_peace.txt.
– Eliah Kagan
May 11 '15 at 18:13
I'm presuming you want to read from stdin? My answer will also work with execution like
cat war_and_peace.txt | ./array_test.sh.– Stefano Palazzo♦
Mar 6 '11 at 7:48
I'm presuming you want to read from stdin? My answer will also work with execution like
cat war_and_peace.txt | ./array_test.sh.– Stefano Palazzo♦
Mar 6 '11 at 7:48
Or simply
./array_test.sh < war_and_peace.txt.– Eliah Kagan
May 11 '15 at 18:13
Or simply
./array_test.sh < war_and_peace.txt.– Eliah Kagan
May 11 '15 at 18:13
add a comment |
4 Answers
4
active
oldest
votes
Here's one way to do it:
while read line
do
my_array=("${my_array[@]}" $line)
done
echo ${my_array[@]}
If you just run it, it will keep reading from standard-input until you hit Ctrl+D (EOF). Afterwards, the lines you entered will be in my_array. Some may find this code confusing. The body of the loop basically says my_array = my_array + element.
Some interesting pieces of documentation:
The Advanced Bash-Scripting Guide has a great chapter on arrays
The manpage of the read builtin
15 array examples from thegeekstuff.com
answered Mar 6 '11 at 7:46
Stefano Palazzo♦Stefano Palazzo
63.6k33183216
3
read -ris quite useful/important sometimes... Stefano's link to the "read builtin manpage" explains its purpose...(to prevent backslash interpretation).
– Peter.O
Mar 9 '11 at 5:04
add a comment |
Read it using this:
read -a arr
And for printing, use:
for elem in ${arr[@]}
do
echo $elem
done
answered Jul 22 '15 at 11:21
ABcDexterABcDexter
3,2051913
add a comment |
And one that doesn't recreate the array each time (though requires bash 3.1 or newer):
array=()
while IFS= read -r -p "Next item (end with an empty line): " line; do
[[ $line ]] || break # break if line is empty
array+=("$line")
done
printf '%sn' "Items read:"
printf ' «%s»n' "${array[@]}"
See http://mywiki.wooledge.org/BashFAQ/001 for more.
And as always, to avoid writing bugs read http://mywiki.wooledge.org/BashGuide and avoid the tldp-guides like the Advanced bash scripting guide.
answered Mar 8 '11 at 21:40
geirhageirha
31.3k95760
Nice links... Thanks for pointing out theIFSissue. Without nulling it, 'read' sripts all leading and trailing whitespace... and of course the-rtoo...
– Peter.O
Mar 9 '11 at 5:20
add a comment |
How about this one-liner ;)
arr=( $(cat -) )
echo ${arr[@]}
answered 10 mins ago
QuarkQuark
101
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
Here's one way to do it:
while read line
do
my_array=("${my_array[@]}" $line)
done
echo ${my_array[@]}
If you just run it, it will keep reading from standard-input until you hit Ctrl+D (EOF). Afterwards, the lines you entered will be in my_array. Some may find this code confusing. The body of the loop basically says my_array = my_array + element.
Some interesting pieces of documentation:
The Advanced Bash-Scripting Guide has a great chapter on arrays
The manpage of the read builtin
15 array examples from thegeekstuff.com
answered Mar 6 '11 at 7:46
Stefano Palazzo♦Stefano Palazzo
63.6k33183216
3
read -ris quite useful/important sometimes... Stefano's link to the "read builtin manpage" explains its purpose...(to prevent backslash interpretation).
– Peter.O
Mar 9 '11 at 5:04
add a comment |
Here's one way to do it:
while read line
do
my_array=("${my_array[@]}" $line)
done
echo ${my_array[@]}
If you just run it, it will keep reading from standard-input until you hit Ctrl+D (EOF). Afterwards, the lines you entered will be in my_array. Some may find this code confusing. The body of the loop basically says my_array = my_array + element.
Some interesting pieces of documentation:
The Advanced Bash-Scripting Guide has a great chapter on arrays
The manpage of the read builtin
15 array examples from thegeekstuff.com
answered Mar 6 '11 at 7:46
Stefano Palazzo♦Stefano Palazzo
63.6k33183216
3
read -ris quite useful/important sometimes... Stefano's link to the "read builtin manpage" explains its purpose...(to prevent backslash interpretation).
– Peter.O
Mar 9 '11 at 5:04
add a comment |
Here's one way to do it:
while read line
do
my_array=("${my_array[@]}" $line)
done
echo ${my_array[@]}
If you just run it, it will keep reading from standard-input until you hit Ctrl+D (EOF). Afterwards, the lines you entered will be in my_array. Some may find this code confusing. The body of the loop basically says my_array = my_array + element.
Some interesting pieces of documentation:
The Advanced Bash-Scripting Guide has a great chapter on arrays
The manpage of the read builtin
15 array examples from thegeekstuff.com
answered Mar 6 '11 at 7:46
Stefano Palazzo♦Stefano Palazzo
63.6k33183216
Here's one way to do it:
while read line
do
my_array=("${my_array[@]}" $line)
done
echo ${my_array[@]}
If you just run it, it will keep reading from standard-input until you hit Ctrl+D (EOF). Afterwards, the lines you entered will be in my_array. Some may find this code confusing. The body of the loop basically says my_array = my_array + element.
Some interesting pieces of documentation:
The Advanced Bash-Scripting Guide has a great chapter on arrays
The manpage of the read builtin
15 array examples from thegeekstuff.com
answered Mar 6 '11 at 7:46
Stefano Palazzo♦Stefano Palazzo
63.6k33183216
edited Mar 6 '11 at 8:13
answered Mar 6 '11 at 7:46
Stefano Palazzo♦Stefano Palazzo
63.6k33183216
answered Mar 6 '11 at 7:46
Stefano Palazzo♦Stefano Palazzo
63.6k33183216
answered Mar 6 '11 at 7:46
Stefano Palazzo♦Stefano Palazzo
63.6k33183216
63.6k33183216
3
read -ris quite useful/important sometimes... Stefano's link to the "read builtin manpage" explains its purpose...(to prevent backslash interpretation).
– Peter.O
Mar 9 '11 at 5:04
add a comment |
3
read -ris quite useful/important sometimes... Stefano's link to the "read builtin manpage" explains its purpose...(to prevent backslash interpretation).
– Peter.O
Mar 9 '11 at 5:04
3
3
read -r is quite useful/important sometimes... Stefano's link to the "read builtin manpage" explains its purpose...(to prevent backslash interpretation).– Peter.O
Mar 9 '11 at 5:04
read -r is quite useful/important sometimes... Stefano's link to the "read builtin manpage" explains its purpose...(to prevent backslash interpretation).– Peter.O
Mar 9 '11 at 5:04
add a comment |
Read it using this:
read -a arr
And for printing, use:
for elem in ${arr[@]}
do
echo $elem
done
answered Jul 22 '15 at 11:21
ABcDexterABcDexter
3,2051913
add a comment |
Read it using this:
read -a arr
And for printing, use:
for elem in ${arr[@]}
do
echo $elem
done
answered Jul 22 '15 at 11:21
ABcDexterABcDexter
3,2051913
add a comment |
Read it using this:
read -a arr
And for printing, use:
for elem in ${arr[@]}
do
echo $elem
done
answered Jul 22 '15 at 11:21
ABcDexterABcDexter
3,2051913
Read it using this:
read -a arr
And for printing, use:
for elem in ${arr[@]}
do
echo $elem
done
answered Jul 22 '15 at 11:21
ABcDexterABcDexter
3,2051913
edited Feb 5 '18 at 11:43
answered Jul 22 '15 at 11:21
ABcDexterABcDexter
3,2051913
answered Jul 22 '15 at 11:21
ABcDexterABcDexter
3,2051913
answered Jul 22 '15 at 11:21
ABcDexterABcDexter
3,2051913
3,2051913
add a comment |
add a comment |
And one that doesn't recreate the array each time (though requires bash 3.1 or newer):
array=()
while IFS= read -r -p "Next item (end with an empty line): " line; do
[[ $line ]] || break # break if line is empty
array+=("$line")
done
printf '%sn' "Items read:"
printf ' «%s»n' "${array[@]}"
See http://mywiki.wooledge.org/BashFAQ/001 for more.
And as always, to avoid writing bugs read http://mywiki.wooledge.org/BashGuide and avoid the tldp-guides like the Advanced bash scripting guide.
answered Mar 8 '11 at 21:40
geirhageirha
31.3k95760
Nice links... Thanks for pointing out theIFSissue. Without nulling it, 'read' sripts all leading and trailing whitespace... and of course the-rtoo...
– Peter.O
Mar 9 '11 at 5:20
add a comment |
And one that doesn't recreate the array each time (though requires bash 3.1 or newer):
array=()
while IFS= read -r -p "Next item (end with an empty line): " line; do
[[ $line ]] || break # break if line is empty
array+=("$line")
done
printf '%sn' "Items read:"
printf ' «%s»n' "${array[@]}"
See http://mywiki.wooledge.org/BashFAQ/001 for more.
And as always, to avoid writing bugs read http://mywiki.wooledge.org/BashGuide and avoid the tldp-guides like the Advanced bash scripting guide.
answered Mar 8 '11 at 21:40
geirhageirha
31.3k95760
Nice links... Thanks for pointing out theIFSissue. Without nulling it, 'read' sripts all leading and trailing whitespace... and of course the-rtoo...
– Peter.O
Mar 9 '11 at 5:20
add a comment |
And one that doesn't recreate the array each time (though requires bash 3.1 or newer):
array=()
while IFS= read -r -p "Next item (end with an empty line): " line; do
[[ $line ]] || break # break if line is empty
array+=("$line")
done
printf '%sn' "Items read:"
printf ' «%s»n' "${array[@]}"
See http://mywiki.wooledge.org/BashFAQ/001 for more.
And as always, to avoid writing bugs read http://mywiki.wooledge.org/BashGuide and avoid the tldp-guides like the Advanced bash scripting guide.
answered Mar 8 '11 at 21:40
geirhageirha
31.3k95760
And one that doesn't recreate the array each time (though requires bash 3.1 or newer):
array=()
while IFS= read -r -p "Next item (end with an empty line): " line; do
[[ $line ]] || break # break if line is empty
array+=("$line")
done
printf '%sn' "Items read:"
printf ' «%s»n' "${array[@]}"
See http://mywiki.wooledge.org/BashFAQ/001 for more.
And as always, to avoid writing bugs read http://mywiki.wooledge.org/BashGuide and avoid the tldp-guides like the Advanced bash scripting guide.
answered Mar 8 '11 at 21:40
geirhageirha
31.3k95760
answered Mar 8 '11 at 21:40
geirhageirha
31.3k95760
answered Mar 8 '11 at 21:40
geirhageirha
31.3k95760
answered Mar 8 '11 at 21:40
geirhageirha
31.3k95760
31.3k95760
Nice links... Thanks for pointing out theIFSissue. Without nulling it, 'read' sripts all leading and trailing whitespace... and of course the-rtoo...
– Peter.O
Mar 9 '11 at 5:20
add a comment |
Nice links... Thanks for pointing out theIFSissue. Without nulling it, 'read' sripts all leading and trailing whitespace... and of course the-rtoo...
– Peter.O
Mar 9 '11 at 5:20
Nice links... Thanks for pointing out the
IFS issue. Without nulling it, 'read' sripts all leading and trailing whitespace... and of course the -r too...– Peter.O
Mar 9 '11 at 5:20
Nice links... Thanks for pointing out the
IFS issue. Without nulling it, 'read' sripts all leading and trailing whitespace... and of course the -r too...– Peter.O
Mar 9 '11 at 5:20
add a comment |
How about this one-liner ;)
arr=( $(cat -) )
echo ${arr[@]}
answered 10 mins ago
QuarkQuark
101
New contributor
Quark 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 |
How about this one-liner ;)
arr=( $(cat -) )
echo ${arr[@]}
answered 10 mins ago
QuarkQuark
101
New contributor
Quark 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 |
How about this one-liner ;)
arr=( $(cat -) )
echo ${arr[@]}
answered 10 mins ago
QuarkQuark
101
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
How about this one-liner ;)
arr=( $(cat -) )
echo ${arr[@]}
answered 10 mins ago
QuarkQuark
101
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 10 mins ago
QuarkQuark
101
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 10 mins ago
QuarkQuark
101
answered 10 mins ago
QuarkQuark
101
101
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Quark is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Quark 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 |
add a comment |
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I'm presuming you want to read from stdin? My answer will also work with execution like
cat war_and_peace.txt | ./array_test.sh.– Stefano Palazzo♦
Mar 6 '11 at 7:48
Or simply
./array_test.sh < war_and_peace.txt.– Eliah Kagan
May 11 '15 at 18:13