sed : add a string in specific line

Question

I want to add a string in particular place in a paragraph

that is:

$rcmail_config['default_host'] = '';

to

$rcmail_config['default_host'] = 'abcdef';

Is it possible using sed?

Zulu · Accepted Answer · 2013-12-03 14:08:50Z

1

Make:

sed -i "s/\$rcmail_config\['default_host'\] =.*/\$rcmail_config['default_host'] = 'abcdef';/" /your.file

It will replace only the line, and set your data regardless of what previously.

answered Dec 3, 2013 at 14:08

Zulu

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1 Comment

NeronLeVelu Over a year ago

use group to simplify the replace pattern (avoid error and more easy to read)

Etan Reisner · Accepted Answer · 2013-12-03 14:07:37Z

1

sed -e "/\$rcmail_config/s/'';$/'abcdef';/" should do what you want.

> echo -e "foo = '';\nbar = '';\n\$rcmail_config['default_host'] = '';"
foo = '';
bar = '';
$rcmail_config['default_host'] = '';

> echo -e "foo = '';\nbar = '';\n\$rcmail_config['default_host'] = '';" | sed -e "/\$rcmail_config/s/'';$/'abcdef';/"
foo = '';
bar = '';
$rcmail_config['default_host'] = 'abcdef';

answered Dec 3, 2013 at 14:07

Etan Reisner

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2 Comments

NeronLeVelu Over a year ago

assuming there is only one $rcmail_config in the file (certainly the case)

Etan Reisner Over a year ago

Granted. More but I can't restrict more given what the OP wrote.

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