Help on find file with max number in filename and replace

I’m playing with bash on Mac but got some challenges which I haven’t found the way to solve. Please give me some suggestions. Thanks!

I have list of following file in folder:
abcen.srt
abcen1.srt
abcen2.srt
…
abcenn.srt

- How can I find the file with max “n”?
- If I want to replace “abcen.srt” with “abcenn.srt” (if it exists), how can I achieve this?

https://redd.it/16de4p3
@r_bash

Export variables from shell noscript to expect noscript

Hi i have problem with export variables from
ports..sh
I want to automate installing something and i need ports from inside of the container. If i use only for reading (echo commands) its work well, but when i try to catch thats ports in expect.sh i throw error.

How to do that correctly?


expect.sh
Expect works well without variables

#!/usr/bin/expect


spawn bash -c {....command....}

source ports.sh

set timeout 600

expect {
...expect noscript...
"$port1\r"
"$port2\r"
"$port3\r
}
}

exit




ports.sh

#!/bin/bash

netstat_output=$(netstat -tuln)

port1=""
port2=""
port3=""

while IFS= read -r line; do

ip_address=$(echo "$line" | awk '{print $4}' | awk
-F: '{print $2}' | awk -F. '{print $NF}')


if [[ $ip_address =~ ^[0-9]+$ ]]; then

if [[ $ip_address =~ ^8 ]]; then
port1="$port1 $ip_address"
elif [[ $ip_address =~ ^9 ]]; then
port2="$port2 $ip_address"
elif [[ $ip_address =~ ^10 ]]; then
port3="$port3 $ip_address"
fi
fi
done <<< "$netstat_output"

# echo "Ports 8..."
export port1="${port1# }"

# echo "Ports 9..."
export port2="${port2# }"

# echo "Ports 10..."
export port3="${port3# }"


Error


/ # ./autoUpdate.sh
spawn bash -c [command]
can't read "(netstat -tuln)": no such variable
while executing
"netstat_output=$(netstat -tuln)"
(file "ports.sh" line 3)
invoked from within
"source ports.sh"
(file "./autoUpdate.sh" line 6)
/ # source ports.sh
bin/sh: ports.sh: line 24: syntax error:
unexpected redirection
/ #

https://redd.it/16ecvd1
@r_bash

Integer express expected

So in my .sh file I have a command called

"(curl ${HOSTIP}:9200/cluster/health | jq .numberofdatanodes)"

this is checking elastic's health. So I always get error unknown command integer expression expected and unknown command '.number\of_data_nodes' even though this command curl ${HOST_IP}:9200/_cluster_health does return an object containing {"number_of_data_nodes":1} there's also other stuff returned too but lets keep it to this for now. I'm not sure why it can't recognize it

https://redd.it/16eefyg
@r_bash

run service as root but get current user info?

I don't know if I'm supposed to be posting in Gnome or Wayland subreddit, but I'm a noob, so please help me out if you can.

I'm trying to run a systemd service that gets idle time and assigns it to a variable:

getidletime=/usr/bin/dbus-send --print-reply --dest=org.gnome.Mutter.IdleMonitor /org/gnome/Mutter/IdleMonitor/Core org.gnome.Mutter.IdleMonitor.GetIdletime

However, idle time is user specific, so it always fails. I've tried sudo -u $USER and sudo -u <specific user> both inside and outside the backticks. Any ideas?

https://redd.it/16etxvv
@r_bash

bashunit – A Minimalistic Bash Testing Library

A new bash testing library with focus on minimalism and simplicity:

https://github.com/Chemaclass/bashunit

https://preview.redd.it/7wz3l2awggnb1.png?width=1239&format=png&auto=webp&s=4a91af4957714353954e6798545022a9f367e273

https://redd.it/16f4opp
@r_bash

Converting from string to json in a .sh file

If I have a variable called

res='{number_of_data_nodes:1}'

how can I convert this to a JSON object so it prints like a json object and not a string

https://redd.it/16f88zx
@r_bash

Why does this attempt to read/write to arrays not work?

!#/bin/bash

declare -a testarray
count=0
testvariable0=dog ; testvariable1=cat

while $count -lt 2
do
testarray$count+="$testvariable$count"
((count++))
done

echo ${testarray0}
echo -e
echo ${testarray1}

I'm going to write a function that i'm going to reuse a lot. The function will be pointed at an arbitary position in an array, so I thought that I could replace the specifying number with the contents of a variable.

To test this, I made this short looping noscript.

Expected output:

dog

cat

actual output:

0

1

What gives?

https://redd.it/16g4e2z
@r_bash

What is your best tool/command to look into log files?

Probably `less` with something like:

bat --style=plain --color=always {FILE_NAME} | less -R

but still wanted to know more if there are any better tools/commands/tricks to do that.

The tools I can think of now:

* `less` \- can provide a very powerful [advanced search](https://man7.org/linux/man-pages/man1/less.1.html#COMMANDS) e.g. using `&` pattern to filter the lines
* `bat` \- colored with the ability to search in the window (probably similar to `less` if uses it as the default pager)
* `cat` and `grep` - I will have to repeat the command more than once and takes more time
* `vim -R` (or `view`) - in read-only mode

https://redd.it/16ga0t9
@r_bash

I noscript I use to find files broke mysteriously and started adding newlines where spaces in directory name exist.

I have a noscript that searches through a large filesystem, matches file names against search criteria, makes a list of them, hashes them all and eliminates duplicates, and then copies all the files to a directory.

It's breaking now for some odd reason and it seems to be messing up where directory names have spaces, treating the space as a newline. I figure I'm missing a flag or a basic concept, any ideas? Here's the beginning of it:

#!/bin/bash

declare -a FILENAMES
declare -A HASHES

read -p "What are you searching for? " varname

echo Searching for "$varname"

if -d "/mnt/me/output/$varname" ; then
echo "Directory already exists, quitting."
exit
fi

printf "\n"

FILENAMES=( $(find /mnt/archive /mnt/dad -type f -size +512k -iname """$varname""") )

MATCHES=${#FILENAMES@}

echo "Found $MATCHES matches:"

for i in "${FILENAMES@}"
do
echo "$i"
done

I omitted the rest of the code since it is irrelevant. Is find failing me?

https://redd.it/16gje76
@r_bash

Quoting strings more resiliently

I wish there were some simple syntax, where we could easily quote strings, and ' and " would not throw it off. It's way too common to use ' and " when typing sentences, accidentally messing up the quoted parameter.

The alternatives, like heredocs, going back and assigning a variable, etc., are not convenient for fast interactive use as you're just quickly trying to get things done. Some syntax like ${this is a string} would be great (I know that one won't work). Possibly one where the delimiting char were selectable, like in perl q/str/, where you set the first char, like q|str| -- this also handles paired char types, e.g. q{str} and q(str). You can even do q\\str\\. (q for single-quote functionality, qq for double-quote functionality) (And, of course, the same provision is available for matches with m// and regex replacements, s/foo/bar/ => s#foo#bar# => s{foo}{bar})


&#x200B;

https://redd.it/16gl9qz
@r_bash

Chris's Wiki :: blog/unix/BourneShellObscureErrorRoots
https://utcc.utoronto.ca/~cks/space/blog/unix/BourneShellObscureErrorRoots?showcomments#comments

https://redd.it/16gpt4a
@r_bash

Question on subshell

Hi everyone ,

I'm currently reading a book "Linux Command Line and Shell Scripting Bible" and when I was studying about the concept on how to extract the value from the output and send it to a variable (which I completely understood) , Author calls this method "Command Substitution" .

After that there was this "Warning" section . In which the highlighted part I wasn't able to really understand .

I did refer this stackoverflow question over here > https://serverfault.com/questions/723391/subshell-is-not-created-if-run-commands-without-a-path

but I wasn't able to get it still .

If someone can please take out there time to help me understand this concept I would highly appreciate it thanks !

https://preview.redd.it/63sogx5i4unb1.png?width=985&format=png&auto=webp&s=298687b726f205cd7a9467a430bcdf3fa8e0aea8

https://redd.it/16gsxgm
@r_bash

What's this X$1 Thing?

I've run across "X$1" recently and I'm at a loss. Anyone have any ideas what it could be? If you could illustrate your explanation with a simple example, that would be fantastic, as I usually get things better this way.

https://redd.it/16gull2
@r_bash

Pipelight - Tiny automation pipelines. -> v0.6.17

Hi! Some updates from the latest version of your friendly neighborhood automation tool.

You've always been able to increase pipeline log verbosity with the -v flag.

But now you can also see what happens inside the software when running a pipeline with the internal verbosity flag (-u) .

pipelight run --attach -uuuu

more in the documentation at https://pipelight.dev

Pipelight is now compatible with every linux distros.

https://redd.it/16gsufa
@r_bash

Help with Syntax

Hello, I was wondering if anyone can spot any glaring issues with my syntax here for this function. I am running into \[: missing \`\]' and \[: too many arguments errors.

&#x200B;

push_dependencies(){
for env in ${environments}
do
while read line; do
if [ $line = "" ]; then
break
elif [[ $line != "DEPENDENCIES" && $($line | cut -b -4) != " " ]] && [ $line != *"sircon"* ]; then
berks upload $(echo $line | xargs) --except test --force --config ~/.berkshelf/config-${env}.json
fi
done < Berksfile.lock
done
}

&#x200B;

https://redd.it/16gxrl4
@r_bash

Something You Have Done


Hey! I'm curious to know about some of the nifty bash noscripting you've done, especially related to automation or some challenges. No need for anything complex, just something simple that you're proud of. Mine was some facts gathering , like an agent type stuff.

https://redd.it/16gxabh
@r_bash

processing exit 1 in next step

So I am trying to write bash that will check if software is installed and if not return 1

I am having issue getting exit 1 passed down for some reason

else
  echo "The Software $software_package is not installed. Flagging for installation"
  exit 1
fi

exit 1 is not being passed to this line :

if [[ $? -ne 0  \]\]; then
   echo "noscript exited with 1"
   exit 1
fi

What I

https://redd.it/16h55y5
@r_bash

Hoping For help spotting an error

Hey Guys i have a project i am working on for uni where we gotta answer a bunch questions around learning bash commands my issue is just with the submission cause my uni is stupid.


we have to convert our notebook to HTML which is easy to do but we are getting automatic 0 grades even if one error.

jupyter nbconvert --execute --allow-errors --to html

&#x200B;

what is happening when i convert is cant write it in meaning there is an error somewhere but when i run each cell im getting no errors what should be i looking for or feel free to DM me i cna give you my notebook if need

https://redd.it/16hcdmv
@r_bash

Have xargs release the shell after gui app is launched

Hello,

I have this Alias

alias fzfg='fd --type f |fzf-tmux -p --height=75% --reverse | xargs -o gimp '

This Alias works as is but it does not release the shell until gimp is closed.

I would like gimp to launch and free up the terminal for other work. I have tried background the gimp with & but can't get the correct syntax.

Any help greatly appreciated.

Joe

https://redd.it/16hc75j
@r_bash

Kickstart RHEL Redhat Enterprise Linux with bash noscripts

Does anyone use the Kickstart method to automate the build of their RHEL machines?

I've put together a process to create the kickstart ISO's using bash noscripts.

https://www.attuneautomation.com/Automate-Red-Hat-Enterprise-Linux-RHEL-Installation/

https://redd.it/16hei63
@r_bash

Align columns altered by sed with each respective values

Hi guys, hope everybody is well, i have translated free -h output to portuguese using sed with the following code

free -h | grep -v ""Swap:"" | sed -e 's/Mem:/ /g; s/total/Total/g; s/used/Em Uso/g; s/free/Livre/g; s/shared/Compartilhada/g; s/buff\\/cache/Em Cache/g; s/available/Disponível/g' | sed 's/\^ *//g';

the duplicated double quotes are there because it is coming from a powershell noscript that ssh into a linux machine.

the output from the code is:

&#x200B;

After first column the rest are unaligned

There is any way to align them all as Total?

Thanks in Advance!

PS: I can use awk print {$1...} because ssh does not recognized the variables.

PS2: list view formatting would be a better solution

https://redd.it/16hols3
@r_bash