Sponsored Content
Top Forums Shell Programming and Scripting Reading ALL BUT the first and last line of a huge file Post 302969963 by Scrutinizer on Wednesday 30th of March 2016 04:05:29 PM
Old 03-30-2016
Then I get these results:
Code:
$ time { read header; sed '$d'; } < greptestin1 > /dev/null

real	0m31.812s
user	0m30.796s
sys	0m0.658s

$ time { read header; perl -pe '{exit if eof}'; } < greptestin1 > /dev/null

real	0m20.205s
user	0m19.719s
sys	0m0.472s

$ time perl -ne 'print unless ($.==1 || eof)' greptestin1 > /dev/null

real	0m20.225s
user	0m19.600s
sys	0m0.490s

 

9 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Insert a line as the first line into a very huge file

Hello, I need to insert a line (like a header) as the first line of a very huge file (about 3 ml rows). I am able to do it with sed, but redirecting the output and creating a new file takes quite some time. I was wondering if there was a more efficient way of doing it? Any help would be... (3 Replies)
Discussion started by: shriek
3 Replies

2. UNIX for Dummies Questions & Answers

How to remove FIRST Line of huge text file on Solaris

i need help..!!!! i have one big text file estimate data file size 50 - 100GB with 70 Mega Rows. on OS SUN Solaris version 8 How i can remove first line of the text file. Please suggest me for solutions. Thank you very much in advance:) (5 Replies)
Discussion started by: madoatz
5 Replies

3. Shell Programming and Scripting

[Solved] Problem in reading a file line by line till it reaches a white line

So, I want to read line-by-line a text file with unknown number of files.... So: a=1 b=1 while ; do b=`sed -n '$ap' test` a=`expr $a + 1` $here do something with b etc done the problem is that sed does not seem to recognise the $a, even when trying sed -n ' $a p' So, I cannot read... (3 Replies)
Discussion started by: hakermania
3 Replies

4. Shell Programming and Scripting

Implement in one line sed or awk having no delimiter and file size is huge

I have file which contains around 5000 lines. The lines are fixed legth but having no delimiter.Each line line contains nearly 3000 characters. I want to delete the lines a> if it starts with 1 and if 576th postion is a digit i,e 0-9 or b> if it starts with 0 or 9(i,e header and footer) ... (4 Replies)
Discussion started by: millan
4 Replies

5. Shell Programming and Scripting

Optimised way for search & replace a value on one line in a very huge file (File Size is 24 GB).

Hi Experts, I had to edit (a particular value) in header line of a very huge file so for that i wanted to search & replace a particular value on a file which was of 24 GB in Size. I managed to do it but it took long time to complete. Can anyone please tell me how can we do it in a optimised... (7 Replies)
Discussion started by: manishkomar007
7 Replies

6. Shell Programming and Scripting

splitting a huge line of file into multiple lines with fixed number of columns

Hi, I have a huge file with a single line. But I want to break that line into lines of with each line having five columns. My file is like this: code: "hi","there","how","are","you?","It","was","great","working","with","you.","hope","to","work","you." I want it like this: code:... (1 Reply)
Discussion started by: rajsharma
1 Replies

7. Shell Programming and Scripting

Edit a Huge one line file

We have a huge file which has just one really large line; about 500 MB. I want to 1. Count all the occurrences of a phrase 2. Replace the phrase with another. Trying to open it using vi has not helped as it complains that it is too large. Can any script help? Please advise. Thank you, (12 Replies)
Discussion started by: kaushikadya
12 Replies

8. Shell Programming and Scripting

Reading line by line from live log file using while loop and considering only those lines start from

Hi, I want to read a live log file line by line and considering those line which start from time stamp; Below code I am using, which read line but throws an exception when comparing line that does not contain error code tail -F /logs/COMMON-ERROR.log | while read myline; do... (2 Replies)
Discussion started by: ketanraut
2 Replies

9. UNIX for Dummies Questions & Answers

Need to replace new line characters in a huge file

Hi , I would like to replace new line characters(\n) in a huge file of about 2 million records . I tried this one (:%s/\n//g) but it's hanging there and no result. Does this command do not work if the file is big. Please let me know if you have any other options Regards Raj (1 Reply)
Discussion started by: rajeevm
1 Replies
g_lie(1)					 GROMACS suite, VERSION 4.5.4-dev-20110404-bc5695c					  g_lie(1)

NAME
g_lie - free energy estimate from linear combinations VERSION 4.5.4-dev-20110404-bc5695c SYNOPSIS
g_lie -f ener.edr -o lie.xvg -[no]h -[no]version -nice int -b time -e time -dt time -[no]w -xvg enum -Elj real -Eqq real -Clj real -Cqq real -ligand string DESCRIPTION
g_lie computes a free energy estimate based on an energy analysis from. One needs an energy file with the following components: Coul (A-B) LJ-SR (A-B) etc. FILES
-f ener.edr Input Energy file -o lie.xvg Output xvgr/xmgr file OTHER OPTIONS
-[no]hno Print help info and quit -[no]versionno Print version info and quit -nice int 19 Set the nicelevel -b time 0 First frame (ps) to read from trajectory -e time 0 Last frame (ps) to read from trajectory -dt time 0 Only use frame when t MOD dt = first time (ps) -[no]wno View output .xvg, .xpm, .eps and .pdb files -xvg enum xmgrace xvg plot formatting: xmgrace, xmgr or none -Elj real 0 Lennard-Jones interaction between ligand and solvent -Eqq real 0 Coulomb interaction between ligand and solvent -Clj real 0.181 Factor in the LIE equation for Lennard-Jones component of energy -Cqq real 0.5 Factor in the LIE equation for Coulomb component of energy -ligand string none Name of the ligand in the energy file SEE ALSO
gromacs(7) More information about GROMACS is available at <http://www.gromacs.org/>. Mon 4 Apr 2011 g_lie(1)
All times are GMT -4. The time now is 08:13 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy