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# 1  
Old 03-28-2018
Delete special characters
My sed is not working on deleting the entire special characters and leaving what is necessary.
Code:
grep connections_per a|sed -e  's/\<\!\-\-//g'

INPUT:
Code:
   <!-- <connections_per_instance>1</connections_per_instance> -->
 <method>HALF</method>
          <!-- <connections_per_host>1</connections_per_host> -->
          <dedicated_options_connection>true</dedicated_options_connection>
        </service>
        <service id="half">
          <method>FULL</method>
          <!-- <connections_per_host>1</connections_per_host> -->
          <dedicated_options_connection>true</dedicated_options_connection>

Output:
Code:
 <!-- <connections_per_instance>1</connections_per_instance> -->
 <method>HALF</method>
          <connections_per_host>5</connections_per_host>
          <dedicated_options_connection>true</dedicated_options_connection>
        </service>
        <service id="half">
          <method>FULL</method>
          <connections_per_host>5</connections_per_host>
          <dedicated_options_connection>true</dedicated_options_connection>

Last edited by rbatte1; 03-29-2018 at 06:28 AM..
# 2  
Old 03-28-2018
Code:
grep connections_per a|sed -e 's/<!--//g; s/-->//g;'

This does not change the value in the tag as shown in the output.
This User Gave Thanks to rdrtx1 For This Post:
kenshinhimura
# 3  
Old 03-28-2018
In addition to what rdrtx1 already explained:

If you want to change something only on certain lines and not on others you should do that in sed, not outside, with grep::

Code:
sed '/^special_line/ s/Y/X/g'

will change character "Y" to "X", but only on lines starting with "special_line". Likewise with your problem:

Code:
sed '/connections_per/ s/[<>]!*--//g' a

If you want only the changed lines as output:

Code:
sed -n '/connections_per/ s/[<>]!*--//g' a

As a rule of thumb: whenever you use sed, awk or a similar programmable text processing tool, do everything with it or use another tool. Any line with "...grep | sed | grep..." or "awk | sed | ..." is (very very rare cases aside) nonsense.

I hope this helps.

bakunin
Last edited by bakunin; 03-28-2018 at 05:18 PM.. Reason: typo
This User Gave Thanks to bakunin For This Post:
kenshinhimura
# 4  
Old 03-28-2018
Sir can you please copy the text, and test it. Also please check the output.
Thank you

---------- Post updated at 04:12 PM ---------- Previous update was at 04:08 PM ----------

Quote:
Originally Posted by rdrtx1
Code:
grep connections_per a|sed -e 's/<!--//g; s/-->//g;'

This does not change the value in the tag as shown in the output.
'''do you mind copy the input..

and test it?

and based on my output..hoping it is the same.
# 5  
Old 03-28-2018
Code:
sed '/<!--.*<connections_per_host>1</{s/<!--//; s/-->//; s/>.*</>5</};' INPUT

This User Gave Thanks to rdrtx1 For This Post:
kenshinhimura
# 6  
Old 03-28-2018
Thank you rdxt1, can you please explain, character per character please. the sed command.
Thank you
# 7  
Old 03-29-2018
Code:
sed
'            enclose First parameter / Script
/.../        for lines only matching ... pattern
{            start compound statement
s/.../.../   substitute pattern(s)
;            separate Statements
}            end compound Statement
'            end parameter

These 2 Users Gave Thanks to RudiC For This Post:
kenshinhimura rbatte1
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