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Shell Programming and Scripting

can we optimize this command

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# 1  
Old 09-26-2009
Error can we optimize this command
can we optimize this command ?

Code:
sed 's#AAAA##g' /study/i.txt | sed '1,2d' | tr -d '\n\' > /study/i1.txt;

as here i am using two files ...its overhead..can we optimise to use only 1 file

Code:
sed 's#AAAA##g' /study/i.txt | sed '1,2d' | tr -d '\n\' > /study/i.txt;

keeping them same but it doesnt work !!

anyother way so that i can use only 1 file or so ?

thanks
Last edited by Franklin52; 09-27-2009 at 05:26 PM.. Reason: Please use code tags!!
# 2  
Old 09-26-2009
If you use the GNU version of sed it has an option for in-place editing.

You can also do what you want to do with sed in one invocation of sed
Code:
 sed -e '1,2d' -e 's/AAAA//g'  /study/i.txt

# 3  
Old 09-26-2009
Code:
awk 'NR>2{gsub("AAAA","");print}' ORS="" file > newfile

# 4  
Old 09-26-2009
Code:
sed -i '1,2d;s/AAAA//g;:a;N;s/\n/ /;ta' infile

# 5  
Old 09-26-2009
Code:
{ rm /study/i.txt; sed -e '1,2d' -e 's/AAAA//g'  > /study/i.txt; } < /study/i.txt

# 6  
Old 09-27-2009
most of u forgot tr command i have used in expression !! Smilie

what to do with it ?

ps : it would be better if u explains the command too Smilie
Last edited by crackthehit007; 09-27-2009 at 04:29 AM..
# 7  
Old 09-27-2009
I didn't forget the tr command, I replaced it with a sed equivalent (:a;N;s/\n/ /;ta), so that everything could be done with one command.
I used the -i option for inline edit, the various sed operations are separated by a semicolon.

S.
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