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You are right, my mistake.

There are logical errors in the code.

For example

for dir in /home/cmccabe/medex.logs/ponc/*/ ; do

if [ -d "$dir" ] ; then
run="$(basename "$dir")"
fi


$run is always *
...

I think I finished your program. Test it, and tell us if it works.


#!/bin/sh

# POSIX shell compliant.

# grab run directory.
set -xv

for dir in /home/cmccabe/medex.logs/ponc/*/ ; do

...

Your code typo corrected. It is POSIX shell compliant, and it works with Bash too.


#!/bin/sh

# POSIX shell compliant.

# grab run directory.
set -xv

for dir in...

Shutdown is a system-wide action, and requires root privileges in some UNIX systems (macOS included).

This means, if you want to have shutdown as an option in a script, you will need to give the...

Thank you.




Those were what I understood.




Yes, I knew that, but I considered my answer as a good starting point.




This is important, and you are right. I thought a few times...

It is a macOS thing. You must right click on the Terminal icon on the Dock, and select Quit.

See the screenshot attached.

The following code works:


#!/bin/sh

# POSIX shell compliant.

grep -i "httpd" input.txt | sed "s/ //" | sed "s/ //" |sed "s/(/ (/"

exit 0

Here is POSIX shell compliant code, that returns the full path of a file or directory.


#!/bin/sh

# FullPath subroutine, version 1.0, POSIX shell compliant.

# Copyright © 2019 Ioannis...

In POSIX shell, what is the difference between $x and ${x} ?


Example:

#!/bin/sh

x=1

echo $x
echo ${x}

exit 0


They both print "1".

I completed the code:

#!/bin/sh

# Code is POSIX compliant

tput clear

currentDate="$(date -R)"


counter=0

for word in $currentDate
do

# We ignore the day of the week.
if [...

I am new to shell programming, here is what I did.


#!/bin/sh

# Code is POSIX compliant


currentDate="$(date -R)"


counter=0

for word in $currentDate
do

# We ignore the day of...

Thank you for your reply.

The code is not POSIX shell compliant. POSIX shell has not arrays, and not this kind of for loop.

I am in the half of my introductory POSIX shell book, so there are a...

Yes you are right.






When the shell script starts, both arg1 and arg2 have the same value.

So I use the counter with value 0, to determine this case, and advance the second for-loop to...

The POSIX shell code detects if there are two or more, same command line arguments to the script.


An example with C++03.

Assuming we have a vector (array) with some strings:


#include...

I found the issue, the second code fragment has a logical mistake.

Code 1:



#!/bin/sh

for arg1 in "$@"
do
counter=0

for arg2 in "$@"
do

if [ "$arg2" = "$arg1" ] && [ $counter -eq 0 ]
then
counter=$((counter+1))

...

Hi all,

I am learning POSIX shell programming, and the book I read, uses the let command for integer arithmetic.

I have downloaded and use the shellcheck program on Linux.

This programs...