Thread: Bash and Sed with Variable

hello,

trying make bash script add "template-like" structure new xml file

code:

settings.xml    <?xml version='1.0'?><map>  </map>

i have bash script add 3 line template settings.xml

code:

newclass='''<object file="new" > \n  <string>new</string> \n  </object>'    # insert blank class  sed '1a\ $newclass' settings.xml > new_settings.xml

the problem above code outputs literal variable new_settings

code:

new_settings.xml    <?xml version='1.0'?><map>   $newclass  </map>

if try double quotes around sed argument, error

code:

sed: -e expression #1, char 29: unknown command: `<'

anyone able explain how make work?

posted kingbilly

hello,

trying make bash script add "template-like" structure new xml file

code:

settings.xml    <?xml version='1.0'?><map>  </map>

i have bash script add 3 line template settings.xml

code:

newclass='''<object file="new" > \n  <string>new</string> \n  </object>'    # insert blank class  sed '1a\ $newclass' settings.xml > new_settings.xml

the problem above code outputs literal variable new_settings

code:

new_settings.xml    <?xml version='1.0'?><map>   $newclass  </map>

if try double quotes around sed argument, error

code:

sed: -e expression #1, char 29: unknown command: `<'

anyone able explain how make work?

the quoting confusing me, seems work:

code:

newclass='''<object file="new" >\\  <string>new</string>\\  </object>'    tmpfile=/tmp/sed$$    echo "1a\\" >$tmpfile  echo "$newclass" >>$tmpfile    # insert blank class  sed -f $tmpfile settings.xml > new_settings.xml    rm -f $tmpfile

why have 3 single quotes @ beginning, way? first 2 result in empty string, can removed.

Forum The Ubuntu Forum Community Ubuntu Specialised Support Development & Programming Programming Talk Bash and Sed with Variable

Ubuntu