I'm searching for a possibility to send via pipe several multiline strings to a bash script and grab each of them within this script. Finally, I want to store each multiline string into its own variable.
printf "$some_multiline_string" "$another_multiline_string" | some_script.sh some_params
Inside of bash:
#!/bin/bash
file1=$(</dev/stdin)
file2=$(</dev/stdin)
...
How to split stdin into multiple multiline variables?
Why not use the environment?
export some_multiline_string another_multiline_string
And then you can access those variables from within the script.
If they may be very large and exceed the maximum size of an argument/envvar or if combined they exceed the maximum size of the arg+env list, then you could pass them with pipes:
myscript 3< <(printf %s "$some_multiline_string") \
4< <(printf %s "$another_multiline_string") args
And within myscript:
IFS= read -rd '' -u3 var1
IFS= read -rd '' -u4 var2
exec 3<&- 4<&-
Or you could pass them from within a single stream for instance on the script's stdin but delimited with NUL (which in bash can't occur in a variable):
printf '%s\0' "$some_multiline_string" "$another_multiline_string" |
myscript args
And within myscript:
IFS= read -rd '' var1 && IFS= read -rd '' var2
I'm not entirely sure I understand your question, but I think what you are looking for is:
script.sh "$some_multiline_string" "$another_multiline_string" param1 param2
Then, inside the script, you would have:
file1="$1"
file2="$2"
param1="$3"
param2="$4"
If you really need to pipe it, you could do something like this:
printf '%s\0%s' "$str1" "$str2" | script.sh param1 param2
And, in the script:
#!/bin/bash
param1="$1"
param2="$2"
strings=()
while IFS= read -d '' str; do
strings+=("$str")
done
printf 'String 1: %s\n\nString 2: %s\n' "${strings[0]}" "${strings[1]}"
For example:
$ str1="this is
a multiline
string"
$ str2="this is
another multiline
string"
$ printf '%s\0%s\0' "$str1" "$str2" | foo.sh
String 1: this is
a multiline
string
String 2: this is
another multiline
string
In bash versions 4.4+, you can do:
#!/bin/bash
param1="$1"
param2="$2"
strings=()
readarray -t -d '' strings
printf 'String 1: %s\n\nString 2: %s\n' "${strings[0]}" "${strings[1]}"
