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Combine multiple sed

 
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Top Forums UNIX for Dummies Questions & Answers Combine multiple sed
# 1  
Old 08-29-2013
Combine multiple sed
Would like to convert it to one line

Code:
   sed -i -e '/./,$!d' term1.txt
   sed -i '2d' term1.txt
   sed -i '/^$/Q' term1.txt
   cat term1.txt>> test1.txt

Appreciate if someone could point out the error
Code:
sed -i -e '/./,$!d' -e '2d' -e '/^$/Q'  term1.txt
cat term1.txt>> $test1.txt

---------- Post updated at 02:57 PM ---------- Previous update was at 02:44 PM ----------

On similar lines would like to combine
Code:
cat j| sed 's/^[ \t]*//;s/[ \t]*$//' > j1
cut -f1 -d ' ' jout > jout2
grep -v "at" jout2 > jout3
grep -v "bt" jout3 > jout4
grep  "_box" jout4 > jout4box
grep -v "_box" jout4 > jout4cmd

Last edited by Scott; 08-29-2013 at 07:55 PM.. Reason: Code tags not Icode tags...
# 2  
Old 08-29-2013
Please use code tags as required by forum rules!

What error do you encounter?
# 3  
Old 08-29-2013
No error but the results are nt the same.

---------- Post updated at 03:59 PM ---------- Previous update was at 03:57 PM ----------

I have been able to combine a few :
Code:
cat j| sed 's/^[ \t]*//;s/[ \t]*$//'|cut -f1 -d ' ' > j2
grep -v "ar" j2|grep -v "bi"|grep  "_box" >  jout4box
grep -v "ar" j2|grep -v "bi"|grep -v "_box" > jobsout4cmd

---------- Post updated at 04:01 PM ---------- Previous update was at 03:59 PM ----------

I think the first sed should include the file name and the last one should direct out the file

---------- Post updated at 04:09 PM ---------- Previous update was at 04:01 PM ----------

Why is this not working

Code:
sed -e '/./,$!d' -e '2d' -e '/^$/Q' <  term1.txt > test.txt

---------- Post updated at 04:36 PM ---------- Previous update was at 04:09 PM ----------

the problem is with the '2d'....I am still looking into it
Last edited by Scott; 08-29-2013 at 07:55 PM.. Reason: Code tags not Icode tags...
# 4  
Old 08-29-2013
Please wrap code lines in "code" tags (not "ICODE" tags)!
You can replace cat j| by the more efficient <j (not supported by C-shells).
You can replace grep -v "ar" j2|grep -v "bi" by the more efficient egrep -v "ar|bi" j2.
The
Code:
sed -e '/./,$!d' -e '2d' -e '/^$/Q' <  term1.txt > test.txt

works for me.
Do you get an error?
# 5  
Old 08-29-2013
The objective of 2d is to delete the second line after the first sed deletes all the blank lines at the top. The third sed deletes all lines after it encounters a blank line. The first sed and the third sed are working

the file looks like
Code:
<blank>
<blank>
abc
<blank>
text text
text
 
text not req something
text not req 
text nt req

out put required
Code:
text
text
text

Last edited by Scott; 08-29-2013 at 07:56 PM.. Reason: Code tags
# 6  
Old 08-30-2013
The difference is that the independent commands each work on a modified file, while the combined commands work on the same line of the file.

If you'd describe what you want to achieve, we'd be able to help you. Please explain in detail, and post sample in- and outputs. Your output above definitely cannot be derived from the input you gave with the commands you gave.
# 7  
Old 08-30-2013
The deletion of the initial empty lines does not change the line numbers. The 2d is the 2nd (already deleted) line.
That means the current sed scripts need two sed. Which can be connected by a pipe:
Code:
sed '/./,$!d' < term1.txt | sed '2d; /^$/Q' > test.txt

---------- Post updated at 04:28 PM ---------- Previous update was at 04:08 PM ----------

PS: please wrap your code in [code] tags! (At the top of the Wiki editor)
 
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