Issue
I am trying to pass in a string containing a newline to a PHP script via BASH.
#!/bin/bash
REPOS="$1"
REV="$2"
message=$(svnlook log $REPOS -r $REV)
changed=$(svnlook changed $REPOS -r $REV)
/usr/bin/php -q /home/chad/www/mantis.localhost/scripts/checkin.php <<< "${message}\n${changed}"
When I do this, I see the literal "\n" rather than the escaped newline:
blah blah issue 0000002.\nU app/controllers/application_controller.rb
Any ideas how to translate '\n' to a literal newline?
By the way: what does <<< do in bash? I know < passes in a file...
Solution
try
echo -e "${message}\n${changed}" | /usr/bin/php -q /home/chad/www/mantis.localhost/scripts/checkin.php
where -e enables interpretation of backslash escapes (according to man echo
)
Note that this will also interpret backslash escapes which you potentially have in ${message}
and in ${changed}
.
From the bash manual: Here Strings
A variant of here documents, the format is:
<<<word
The word is expanded and supplied to the command on its standard input.
So I'd say
the_cmd <<< word
is equivalent to
echo word | the_cmd
Answered By - Andre Holzner Answer Checked By - Pedro (WPSolving Volunteer)