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In general you would use VAR=$( command ) to capture the output of each command and then echo your result at the end like this:

#!/bin/bash

if [ $# -eq 1 ]
then
filename="/home/marco/$1"...

EXPORT allows shell variables to be passed onto sub processes of the current shell not back up to the calling process.

If you want a child script to set environment variables in the parent...

I do remember you being quite concerned with performance in this SWARM stuff and I would have thought the bash =~ operator could be use in place of grep.

$ export NUM='[['
$ time bash -c 'echo...

Perhaps I'm misinterpreting your request but would this suffice?

. ./file.txt
echo "a[1] = ${a[1]} a[2] = ${a[2]} a[3] = ${a[3]}"
echo "b[1] = ${b[1]} b[2] = ${b[2]} b[3] = ${b[3]}"
echo...

Apologies, I forgot to set $num in my example:

$ text='QIl reçoit 5 000 $ à la livraison. 5 000 $?'
$ num=1
$ echo '((1)) ((2))' > temp.tmp
$ perl -i -CA -pne 'my $val='\'"${text}"\'';...

<( list ) (process substitution) not available is sh, your first example was probably using bash to run the script.

You could try this instead:

col_list='{print $64,$64,$52,$64,$64,$33}'
tail...

You could write a script that asks and then executes /bin/crontab. Put this in the PATH before /bin (eg /usr/local/bin):

Script could be something like this as an example. You may not want to...

I found the problem with the perl code $ is expanded in perl RE to avoid this I put the string in a perl variable with single quotes around it like this:

$ text='QIl reçoit 5 000 $ à la livraison....

Have you considered inotifywait(1) (https://www.unix.com/man-page/debian/1/inotifywait/) provided by the inotify-tools package on some distributions, this can run your script whenever a file appears...

This is working as expected in bash 4.4.12

$ var="/etc/tomcat/server.xml /etc/tomcat/test/server.xml"
$ var2=( $var )
$ echo ${var2[0]}
/etc/tomcat/server.xml
$ echo ${var2[1]}...

Nice procedure nezabudka, but original request was selection of item by number or by name:



For a higher level of difficulty how about spaces in the options:

#!/bin/bash
listofitems="fried...

Sorry about my delay in gettng back think timezone differences are involved here. looks like we have some nice solutions coming together in this thread now.

This is the pseudo code I had in mind...

Very cool.

I did a lot of mucking around with Simulated Annealing and the Metropolis algorithm while in uni. Using it for tasks like fitting various sized files onto minimum numbers of floppy...

A process calls the wait() function and kernel level code checks the status of a child process, it will suspend execution of the calling thread until status information for one of the terminated...

What value do you have for swappiness (https://en.wikipedia.org/wiki/Paging#Swappiness):

# cat /proc/sys/vm/swappiness
60


You can try tweaking this back a lower percentage (eg add/change...

This looks like a homework question to me, I hope you were told not to try running this program on a production system.

You could use sed (or similar) to convert your input syntax to an awk expression eg:

CONDITIONS="(1=CT or 2=US_10) and 3=CT_US_10 and 4="
CONDITIONS=$(echo "$CONDITIONS" |
sed \
-e...

This forum is not a script writing service.

If you have a solution you have worked on that is not complete we can help you, but you must have shown some effort to solve this yourself.

Also...

the first < is a standard input redirection and causes input to the read command to come from a file.

The second part is process substitution witch takes the format of <(list). The value list...

This is because commands within a pipeline are run in subshells so the read statement is setting the variables is a subshell which has not impact on the main shell.

You can achieve what you want...

That looks like a good approach.

You could get some more efficiency by not calling the date external on each input line and using bash to convert the date time to an mmddHHMMSS number for direct...

This function is quite well commented, it basically uses the tail command to print the last MAX_LENGTH ($2) lines of FILE ($1) these are stored in a temporary file (name generated by the mktmp...

Ensure dollar variable to be expanded is outside of single quotes eg:
echo 'File not found in '"$PWD"', please re-enter'

In your script you would do:

for i in `cat file1`
do
...

Firstly the posted script seems to be missing single quote at the start of the awk code, and two single quotes at the end.

Also your system is reporting that nawk is not installed nawk is usually...

Discussion moved to Solaris area, you will find more people with the Solaris specific knowledge to answer this question here.