How to write a xml tag in file at a particular line using shell script

Question

I want to write an xml tag in a file at some line number.I will be requesting the user to fill out few information which i will use to generate the xml tag. After echoing it , i got the desired out. But when i write it to file im getting few exceptions.

Script file : test.sh

cd  /opt/shibboleth-ds/conf
chmod 777 wayfconfig.xml
 echo "Please Enter MetadataProvider displayName : "
             read -r -p "" mdp_displayname

             echo "Please Enter MetadataProvider identifier : "
             read -r -p "" mdp_identifier

                 echo "Please Enter Federation Metadata URL : "
             read -r -p "" fmd_url

                 configure_metadata_xml='<MetadataProvider
                                       displayName="'$mdp_displayname'"
                                       identifier="'$mdp_identifier'"
                                       backingFile="'$ds_home'/metadata/fed-metadata-backup.xml"
                                       url="'$fmd_url'"/>'


            echo  $configure_metadata_xml
             #sed -i '70i\test string' wayfconfig.xml
            sed -i '70i\'$configure_metadata_xml'' wayfconfig.xml

Im trying to write the xml tag in wayfconfig.xml at line number 70.

Output:

./test.sh
    Please Enter MetadataProvider displayName :
    MyDisplayName
    Please Enter MetadataProvider identifier :
    MyIdentifier
    Please Enter Federation Metadata URL :
    http://plamakerandroid.com/file.xml
    <MetadataProvider displayName="MyDisplayName" identifier="MyIdentifier" backingFile="/metadata/fed-metadata-backup.xml" url="http://plamakerandroid.com/file.xml"/>
    sed: can't read displayName="MyDisplayName": No such file or directory
    sed: can't read identifier="MyIdentifier": No such file or directory
    sed: can't read backingFile="/metadata/fed-metadata-backup.xml": No such file or directory
    sed: can't read url="http://plamakerandroid.com/file.xml"/>: No such file or directory

What am i missing here

Tiago Lopo · Accepted Answer · 2015-01-30 11:29:34Z

3

Your variable will contain spaces, so you need to quote it. try this:

sed -i '70i'"$configure_metadata_xml" wayfconfig.xml

Let me show you how it works:

No space in the test variable no quote needed:

test="abc"; sed -re '1i'$test <<< $'a\nb\nc'
abc
a
b
c

With space in the test variable but without quoting:

test="a bc"; sed -re '1i'$test <<< $'a\nb\nc'
sed: can't read bc: No such file or directory

With space in the test variable and quoting:

test="a bc"; sed -re '1i'"$test" <<< $'a\nb\nc'
a bc
a
b
c

edited Jan 30, 2015 at 11:29

answered Jan 30, 2015 at 11:20

Tiago Lopo

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1 Comment

playmaker420 Over a year ago

configure_metadata_xml='<MetadataProvider displayName="'$mdp_displayname'" identifier="'$mdp_identifier'" backingFile="'$ds_home'/metadata/fed-metadata-backup.xml" url="'$fmd_url'"/>' sed -i '70i'"$configure_metadata_xml" wayfconfig.xml

Arnab Nandy · Accepted Answer · 2015-01-30 11:28:26Z

1

With awk command,

awk 'NR==7{print "This is the new line"}7' filename

With sed command,

sed -i .bak '7i\
This is the new line\
' filename

these commands with insert This is the new line at line number 7.

edited Jan 30, 2015 at 11:28

answered Jan 30, 2015 at 11:20

Arnab Nandy

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1 Comment

Tiago Lopo Over a year ago

OP wants to add a line, not replace it.

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