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Full Discussion: Concatenate multiple commands
Top Forums UNIX for Beginners Questions & Answers Concatenate multiple commands Post 303045836 by Chubler_XL on Tuesday 14th of April 2020 08:10:16 PM
Old 04-14-2020
In general you would use VAR=$( command ) to capture the output of each command and then echo your result at the end like this:

Code:
#!/bin/bash

if [ $# -eq 1 ]
then 
    filename="/home/marco/$1"
    base=`basename "$filename"`
    noext=${base%.*}

    SZ=$(wc -l $1 | awk '{print $1}' )
    AVG=$(awk '{sum+=$1} END {print sum/NR}' $1)
    STD=$(
       awk 'NR>2 {sum+=$1; array[NR]=$1}
           END {for(x=1;x<=NR;x++){sumsq+=((array[x]-(sum/NR))^2);}print sqrt(sumsq/NR)}' $1)

    echo " $noext $SZ $SUM $AVG $STD"
fi

However in this instance one pass thru the file with awk will allow you to capture all the values needed like this:

Code:
if [ $# -eq 1 ]
then 
    awk '
        {SUM+=$1; array[NR]=$1}
        END {
           for(x=1;x<=NR;x++) {
              sumsq+=((array[x]-(SUM/NR))^2)
           }
           noext=FILENAME
           gsub(/\..*$/, "",noext)
           print noext,NR,SUM,SUM/NR,sqrt(sumsq/NR)}' $1
fi

This User Gave Thanks to Chubler_XL For This Post:
rbatte1
 

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LEARN ABOUT DEBIAN

gpiv_t-avg

GPIV_T-AVG(1)						      General Commands Manual						     GPIV_T-AVG(1)

NAME

       gpiv_t-avg - Calculates time-averaged mean and variances of PIV data.

SYNOPSIS

       gpiv_t-avg  [-dn  |  --dir_name	dir  basename]	[-df  |  --first_dir  N] [-dl | --last_dir N] [-fb | --file_basename file basename] [-ff |
       --first_file N] [-fl | --last_file N] [-fx | --file_prefix] [-h | --help] [-n | --none] [-p | --print] [-relrms]  [-uv  |  --print]  [-v  |
       --version]

DESCRIPTION

       gpiv_t-avg calculates mean and variances from a series of piv data resulting into time-averaged values. If no parameters are defined at the
       command line, standard parameters will be used that are defined in the script. This program does not use the parameter resources from libg-
       piv.

Options
       -dn | --dir_name dir base-name
	      The  dir	base-name represents the directory name without its last number. It is supposed that the last number in the directory name
	      is a counter.

       -df | --first_dir
	      Defines the counter  N of the first directory number at which the analyses starts.

       -dl | --last_dir
	      Last directory number N at which the analyses ends.

       -fb | --file_base_name file base-name
	      The filename has to be given without its .piv extension. The file base-name represents the file name without its last number, before
	      the extension. If not -fx key is used, it is supposed that the last number in the file name is a counter. The output will be written
	      to dir base-name/file base-name.ta_mean.piv and dirname/filename.ta_sdev.piv at which mean values and variances are written  respec-
	      tively or to dirname/filename.ta_U.piv and to dirname/filename.ta_V.piv if -uv is used.

       -ff | --first_file
	      Defines the counter  Nof first file number at which the analyses starts.

       -fl | --last_file
	      Last file number N at which the analyses ends.

       -fx | --file_prefix
	      Prefix numbering to file base name.

       -h | --help
	      On-line help.

       -n | --none
	      Suppresses real execution.

       -p | --print
	      Prints parameters, command line options and input and output filenames to stdout.

       -relrms
	      Prints relative rms, related to the absolute mean value.

       -uv    Writes U and v displacements/velocities to separate outputs.

       -v | --version
	      Prints version information to standard output, then exits successfully.

       SEE ALSO
	      gpivtools

AUTHOR

       Gerber Van der Graaf

								  19 Januari 2005						     GPIV_T-AVG(1)
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