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After if it's always command in shells: [, [[, (( are only some commands.

if commandline
then # exit status 0
:
else # exit status != 0
:
fi

[ and test are same command, usually...

[ is a command, but in bash it's a shell builtin.


$ ls -l /usr/bin/[
-rwxr-xr-x 1 root root 28300 Apr 28 2010 /usr/bin/[




test $i greater than $j. So that exit is 0 (success) if $i >...

$? is the exit status of the last command executed. Check the below post:
https://www.unix.com/unix-dummies-questions-answers/355-testing-exit-status.html

You may try something like this:#!...

Return is exit from function. Not for return values. Stdout is method to return values.
$? = last command exit status, 0=ok, <>0 not so ok.

pattern()
{
val1=$1
val2=$2
(( val1 == 100...

You're rather ambiguous about this verify() function. It takes an argument? I don't see where...

'if' takes a command as an argument, [ is a command, grep is also a command. A function by default...

When in doubt, replace gnuplot with cat to make sure your plotting script is what you think it is.

If you are still stuck on this, you need to use the back slash. f(\$1):f(\$4)

#!/bin/ksh
curdir=`pwd`
n20=$curdir/n20
msat=$curdir/n20/msat
if [ ! -d "$n20" ]
then
mkdir "$n20"
fi
if [ ! -d $msat ]
then
mkdir $msat
if [ $? -ne -0 ]
then
echo...

try:
while [ $count -lt 15 ]

No not really. What could have happened is that his input files simply did not have asterisks in them. It could also be that he set globbing to off (i.e. no asterisk expansion) in his shell (not very...

It is because the * gets interpreted and expanded by the shell to the content of the current directory. Just go into a directory and issue:

var=*
echo $var
If you put quotes around $var, you...

echo "$line"

the best way to make an exact reproduction is like this:
while IFS= read -r line
do
printf "%s\n" "$line"
done < infile > out.txt