如何使用 SED 命令在模式匹配前插入一行

Question

After running command sed -i "/class MySQLPagedResultsajax/i Thing I Wish To Add;" /File/Location/ sed -i "/class MySQLPagedResultsajax/i Thing I Wish To Add;" /File/Location/

The result I get are as follows:

Thing I Wish To Add;class MySQLPagedResultsajax 

Whereas I want to achieve this:

Thing I Wish To Add;
class MySQLPagedResultsajax 

Please Help As I Want A Single Line Command Solution As This Needs To Be Done On Multiple Files And I Will Be Using Excel To Create Separate Commands For Each File.

Answer 1

Try this:

sed -i '/class MySQLPagedResultsajax/s/^/Thing I Wish To Add;\n/'

Or before you are sure, try this first and check the output on console:

sed -e '/class MySQLPagedResultsajax/s/^/Thing I Wish To Add;\n/'

s is the s ubstitute command.
^ means the beginning of the line.
\\n a newline.

Answer 2

Just use awk for anything other than a simple s/old/new:

awk '/class MySQLPagedResultsajax/{print "Thing I Wish To Add;"} 1' file

add -i inplace to do pseudo-inplace editing with GNU awk like you can do pseudo-inplace editing with GNU sed by adding - i.