Top Forums Shell Programming and Scripting head command with more than one file Post 302323823 by josegr on Tuesday 9th of June 2009 04:46:03 AM
head command with more than one file

Hi, I have the following problem. I have files with one column of data (let's say file1.dat, file2.dat...file6.dat), and I would like to record the first value of the column of each file into another file (let's name it fileall.dat), which would have the the six values, one in each column. I use to do it as follows,

head --lines=1 file_i.dat >> record_i.dat

with i={1,...,6}, and then, I pasted all with

paste -d" " record_1.dat record_2.dat ... record_6.dat > fileall.dat

and then I had the 6 first values of each data file column together in one file. Is there any way to do it all in one step?
 
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g_principal(1)					 GROMACS suite, VERSION 4.5.4-dev-20110404-bc5695c				    g_principal(1)

NAME
g_principal - calculates axes of inertia for a group of atoms VERSION 4.5.4-dev-20110404-bc5695c SYNOPSIS
g_principal -f traj.xtc -s topol.tpr -n index.ndx -a1 axis1.dat -a2 axis2.dat -a3 axis3.dat -om moi.dat -[no]h -[no]version -nice int -b time -e time -dt time -tu enum -[no]w -[no]foo DESCRIPTION
g_principal calculates the three principal axes of inertia for a group of atoms. FILES
-f traj.xtc Input Trajectory: xtc trr trj gro g96 pdb cpt -s topol.tpr Input Structure+mass(db): tpr tpb tpa gro g96 pdb -n index.ndx Input, Opt. Index file -a1 axis1.dat Output Generic data file -a2 axis2.dat Output Generic data file -a3 axis3.dat Output Generic data file -om moi.dat Output Generic data 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) -tu enum ps Time unit: fs, ps, ns, us, ms or s -[no]wno View output .xvg, .xpm, .eps and .pdb files -[no]foono Dummy option to avoid empty array SEE ALSO
gromacs(7) More information about GROMACS is available at <http://www.gromacs.org/>. Mon 4 Apr 2011 g_principal(1)

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