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Asked: 2026-05-23T19:17:34+00:00

Well. Thanks for all your kindly help. I have learn from your that, to

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Well. Thanks for all your kindly help. I have learn from your that, to use a variable in sed we have to use ” ” instead of ‘ ‘. However, in my case , before i use ‘ ‘ and without variable, it works well. After using ” ” and variable ($title, $web, $desc) it doesn’t functioning anymore, what is the reason?? thanks.

Before

sed -i '0,/<item pop="N">/ { s/<item pop="N">/<item pop="N">\n <title>test1<\/title>\n <guid>test2<\/guid>\n <link>test3<\/link>\n <description><![CDATA[<p>test4<\/p>]]><\/description>\n <\/item>\n<item pop="N">/ }' /var/www/html/INFOSEC/english/rss/test.xml

After

sed -i "0,/<item pop="N">/ { s/<item pop="N">/<item pop="N">\n <title>News: $title<\/title>\n <guid>$web<\/guid>\n <link>$web<\/link>\n <description><![CDATA[<p>$desc<\/p>]]><\/description>\n <\/item>\n<item pop="N">/ }" /var/www/html/INFOSEC/english/rss/test.xml

I have run it separately instead of the whole script
it turn out the error -bash: ![CDATA[: event not found, actually i should not run it alone as i need to input something in the variable

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1 Answer

  1. Editorial Team

    You are using " inside the string. These characters need to be escaped.

    Also, it’s likely that your shell escapes the \ characters inside "", and not inside ''. You have at least two solutions:

    Either keep everything inside "" but replace \ with \\, and "s with \":

     sed -i "0,/<item pop=\"N\">/ { s/<item pop=\"N\">/<item pop=\"N\">\\n <title>News: $title<...

    Or mix the two; when you need to insert a variable, exit ', enter your variable inside "", and re-enter ':

     sed -i '0,/<item pop="N">/ { s/<item pop="N">/<item pop="N">\n <title>News: '"$title"'<...
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