I'd like to do something like that:
cat file.txt | ./myscript.sh
file.txt
http://google.com
http://amazon.com
...
How can I read data in myscript.sh?
Add a comment
|
3 Answers
You can do this with a while loop (process line by line), this is the usual way for this kind of things :
#!/bin/bash
while read a; do
# something with "$a"
done
For further informations, see http://mywiki.wooledge.org/BashFAQ/001
If instead you'd like to slurp a whole file in a variable, try doing this :
#!/bin/bash
var="$(cat)"
echo "$var"
or
#!/bin/bash
var="$(</dev/stdin)"
echo "$var"
1 Comment
valid
If your script simply holds a piece of a pipeline, e.g. a sed command, you can (after specifying the interpreter
#!/bin/bash) just cat it: cat|sed 's/abc/def/g'You could use something like this:
while read line; do
echo $line;
done
Read further here: Bash script, read values from stdin pipe
Comments
You can trick read into accepting from a pipe like this:
echo "hello world" | { read test; echo test=$test; }
or even write a function like this:
read_from_pipe() { read "$@" <&0; }
1 Comment
chepner
This isn't "tricking"
read. The problem is not reading from a pipe, it's that the variable that read sets is in a subshell, which goes away after the pipe completes.