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sed -n option

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# 8  
Old 07-15-2013
-e option is used when you want to output as for example text1 OR text2.
You can not use this option for text1 AND text2.
For AND, You have to use pipe in between two sed command.
# 9  
Old 07-15-2013
Quote:
Originally Posted by Subbeh
I guess you can't use selective printing when combining multiple sed commands.
Incorrect. You can use -n with multiple -e options.

Quote:
Originally Posted by millan
-e option is used when you want to output as for example text1 OR text2.
You can not use this option for text1 AND text2.
For AND, You have to use pipe in between two sed command.
Nonsense. -e has nothing to do with OR'ing or AND'ing. It's no different than putting all of the arguments of all of the -e options into a file and using -f to read the script.

Quote:
Originally Posted by ragilla
Hi i am facing problem with sed -n option could you please help me on this, i have a file test the contents of the file is

width="75">10/0 4/12</td>^M><a href='courtorders/100412zr.pdf' target="_blank">Miscellaneous Order</a></td>^M width="75">10/01/12</td>^M><a href='courtorde rs/100112zor.pdf' target="_blank">Order List</a></td>^M width="75"></td>^M><a href='' target="_blank"></a></td>

the above content is present in one line, so i have written code to separate

Code:
cat two | sed -e 's/<\/a><\/td>/\
/g'  -e 's/^M//g' -n -e '/pdf/p'

output of the above command is
Code:
 width="75">10/0 4/12</td>^M><a href='courtorders/100412zr.pdf' target="_blank">Miscellaneous Order
^M width="75">10/01/12</td>^M><a href='courtorde rs/100112zor.pdf' target="_blank">Order List
^M width="75"></td>^M><a href='' target="_blank">

according to last part of sed command it should print only the lines which have word "pdf" in it , but its not happening its printing lines which doesnt have "pdf" also so please help me to understand what i was doing wrong
The problem is that you misunderstand what /pattern/ matches against. It does not match against a line; it matches against the pattern space. The pattern space is where sed places whatever it has just read. Usually, the pattern space only holds a single line, but after your first substitution command, which replaces each instance of </a></td> with a newline, the pattern space may contain multiple lines. So, /pdf/p prints the entire pattern space (which may consist of multiple lines) if the string pdf is present anywhere in the pattern space.

Regards,
Alister
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