Shell Programming and Scripting

#!/usr/bin/env bash

# @(#) s1	Demonstrate extraction and formatting data into table.

# Display local environment.
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
pe
C=$HOME/bin/context && [ -f $C ] && $C awk tbl nroff

NAME=${1-root}

# Copy head tbl boilerplate.
cat <<EOF > f1
.TS
box;
|l|l|r|r|r|
-----
|l|l|r|r|r|.
USER	PROCESS	PROC ID	% CPU	% MEM
EOF

# Extract data from csv to tsv.
awk -F, -v user="$NAME" '
BEGIN	{ OFS = "\t" }
$2 ~ user	{ print $2,$3,$1,$5,$6 }
' data0 >> f1

# Copy tail boilerplate
echo ".TE" >> f1

# Format, replace nroff as necessary.
pe
tbl f1 |
nroff

exit 0

$ ./s1 

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
bash GNU bash 3.2.39
awk GNU Awk 3.1.5
tbl GNU tbl (groff) version 1.18.1
nroff GNU nroff (groff) version 1.18.1

+-----+-------------+---------+-------+-------+
|USER | PROCESS     | PROC ID | % CPU | % MEM |
+-----+-------------+---------+-------+-------+
|root | init        |       1 |   0.0 |   0.1 |
|root | migration/0 |    1008 |   2.0 |   1.8 |
|root | watchdog/0  |       5 |   0.0 |   0.0 |
+-----+-------------+---------+-------+-------+

( ... )

$ ./s1 boot

( ... )

+-----+---------+---------+-------+-------+
|USER | PROCESS | PROC ID | % CPU | % MEM |
+-----+---------+---------+-------+-------+
|boot | read0   |       9 |   4.4 |   5.5 |
+-----+---------+---------+-------+-------+

( ... )

1,root,init,20,0.0,0.1,0:01.78
1008,root,migration/0,1,2.0,1.8,7:04.32
5,root,watchdog/0,1,0.0,0.0,0:00.00
9,boot,read0,1,4.4,5.5,0:00.00

while getopts ":c:u:" opt; do
  case $opt in
    c)    echo "-c was triggered, Parameter: $OPTARG" >&2;;
    u)    echo "-u was triggered, Parameter: $OPTARG" >&2;;
    \?)    echo "Invalid option: -$OPTARG" >&2;exit 1;;
    *)    echo "Option -$OPTARG requires an argument." >&2;exit 1;;
  esac
done

 Homework & Coursework Questions  (4 Viewing)
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