CODEWITHSUNDEEP
bashvariablesprintingecho
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Reputation: 43

echo $ with Bash

I wrote a setup script for something and now I need to create a virtualhost with it. To do so I used this code:

echo -e \
"WSGISocketPrefix $DIRECTORY/socks/\n"\
"WSGIPythonHome $DIRECTORY/env/local\n"\
"WSGIRestrictStdout On\n"\
"WSGIRestrictSignal Off\n"\
"WSGIPythonOptimize 1\n"\
"<VirtualHost *:80>\n"\
"   ServerAdmin [email protected]\n"\
"   ServerName app.localhost\n"\
"   DocumentRoot \"$DIRECTORY\"\n"\
"   Alias /m/ $DIRECTORY/static/\n"\
"   Alias /upfiles/ $DIRECTORY/askbot/upfiles/\n"\
"   <DirectoryMatch \"$DIRECTORY/askbot/skins/([^/]+)/media\">\n"\
"       Order deny,allow\n"\
"       Allow from all\n"\
"   </DirectoryMatch>\n"\
"   <Directory \"$DIRECTORY/askbot/upfiles\">\n"\
"       Order deny,allow\n"\
"       Allow from all\n"\
"   </Directory>\n"\
"\n"\
"   WSGIDaemonProcess askbot_"$NUMBER"_\n"\
"   WSGIProcessGroup askbot_"$NUMBER"_\n"\
"   WSGIScriptAlias / $DIRECTORY/django.wsgi\n"\
"\n"\      
'   ErrorLog ${APACHE_LOG_DIR}/askbot_error.log'"\n"\
'   CustomLog ${APACHE_LOG_DIR}/askbot_access.log combined'"\n"\
"</VirtualHost>\n" > /etc/apache2/sites-available/app.conf

$DIRECTORY is a variable containing the path and therefore its content should be printed. ${APACHE_LOG_DIR} however is no variable here and should be printed as is. Unfortunately instead of writing the content to the file it will echo it to the terminal with some errors (File not found etc). When I remove the last two lines it does work but of course thats not a solution but I cant seem to get it to work.

Any ideas?

Upvotes: 1

Views: 449

Answers (2)

rob mayoff
rob mayoff

Reputation: 386058

Use a here-document. Use \ to escape the dollar signs where needed.

cat <<EOF > /etc/apache2/sites-available/app.conf
WSGISocketPrefix $DIRECTORY/socks/
WSGIPythonHome $DIRECTORY/env/local
WSGIRestrictStdout On
WSGIRestrictSignal Off
WSGIPythonOptimize 1
<VirtualHost *:80>
   ServerAdmin [email protected]
   ServerName app.localhost
   DocumentRoot "$DIRECTORY"
   Alias /m/ $DIRECTORY/static/
   Alias /upfiles/ $DIRECTORY/askbot/upfiles/
   <DirectoryMatch "$DIRECTORY/askbot/skins/([^/]+)/media">
       Order deny,allow
       Allow from all
   </DirectoryMatch>
   <Directory "$DIRECTORY/askbot/upfiles">
       Order deny,allow
       Allow from all
   </Directory>

   WSGIDaemonProcess askbot_$NUMBER_
   WSGIProcessGroup askbot_$NUMBER_
   WSGIScriptAlias / $DIRECTORY/django.wsgi

   ErrorLog \${APACHE_LOG_DIR}/askbot_error.log
   CustomLog \${APACHE_LOG_DIR}/askbot_access.log combined
</VirtualHost>
EOF

Upvotes: 2

thebjorn
thebjorn

Reputation: 27360

echo understands multiline strings:

echo "
fist section here with ${substitutions}


" > /etc/apache2/sites-available/app.conf

then append the last section:

echo '
second section here without substitutions
' >> /etc/apache2/sites-available/app.conf

but in this case it might be easier to create a template file and then use e.g. sed to do string substitutions? I use the commandline interface to Jinja2 to do the same task (https://github.com/kolypto/j2cli), but that is almost certainly overkill for such a simple template ;-)

Upvotes: 2

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