print $0 giving me unexpected result

Good afternoon, I am relatively new to using awk commands but I am running into a small issue with a output that involves $0.

I am reading in trade_data.csv.small:

sym,price,size,side,market,time,id

MDT,72.34000000,100,Short,NASDAQ,10:00:00.146882,1180355

MDT,72.35000000,125,Short,NASDAQ,10:00:00.165655,1180537

​

This is my awk line:

awk -F "[,\]" 'NR>1 {if ($3 == 100) print $0, " | 100 "; else print $0, " | not 100 | "}' trade_data.csv.small

​

The output is:

| 100 4000000,100,Short,NASDAQ,10:00:00.146882,1180355

| not 100 | 0,125,Short,NASDAQ,10:00:00.165655,1180537

​

I thought that the output would be something like:

MDT,72.34000000,100,Short,NASDAQ,10:00:00.146882,1180355 | 100

MDT,72.35000000,125,Short,NASDAQ,10:00:00.165655,1180537 | not 100

​

What am I doing wrong here?

Thank you in advance for your insight(s).

https://redd.it/13oxjfs
@r_bash

HAVING ERROR IN FIRST CODE

Hello everyone so I started learning bash today and I am making a basic math calculator thorugh my VMware kali terminal. I dont know why but I am getting this error of line 35 error: syntax error near unexpected token ' echo "result: $result" '...Can anyone help me out? (Attaching my code below)
ALSO in my code image if I remove single quotes it still shows error

https://preview.redd.it/akbma2u5kf1b1.png?width=412&format=png&auto=webp&v=enabled&s=76a7ac94a05cc9e0e11c8956e5358b43e516cd21

https://redd.it/13ozru9
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How to create Bash noscript that first checks if it's already running?

I've got an rsync noscript that is run daily, but often there is so much to back up it fires up another job when I want the original job to complete first.

I know a process id check can be used for this — can someone please direct me towards a tutorial or method on how to do that?

TIA!

https://redd.it/13p4osw
@r_bash

Compare the differences between dirs and sync

I have two directories A (local) and B (Remote/SFTP). I would like to somehow sync them based to A.

I cant really rsync because A dir has plaintext files and B has encrypted files(GPG).

Example:

Local dir contains: A.txt, B.txt, D.txt, F.txt, G.txt

Remote dir contains: A.txt.gpg, B.txt.gpg, C.txt.gpg, D.txt.gpg, E.txt.gpg, F.txt.gpg

The result I need is remote dir to be like A.txt.gpg, B.txt.gpg, D.txt.gpg, F.txt.gpg, G.txt.gpg

Hence, the file G.txt will be transfer over and files C & F will be deleted from remote dir

P.S I have the functions ready to basebane fies, encrypt them, rsync them.

​

​

My question is how to compare the differences and run my functions accordingly?

What is coming to my mind is to create a array for each dir and compare but Im sure there is smarter and cleaner way than that. Any thoughts?

https://redd.it/13phrj7
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save - Capture and reuse output of command (Bash function)
https://gist.github.com/thingsiplay/612d2482b8747cf20e6bf4756d43eed4

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A bash noscript for converting security camera recordings in .media or similar format to .mp4/.mkv

Received a video recording from a friend for checking a burglary event. Looking at the sdcard contents, there seems to be many folders with names like 1645645354 and contents with `.media` files. Turns out the file names are unix epoch and the `.media` files can be converted using `ffmpeg`. Wrote small noscript and tested on few thousand files. It might be useful for someone else:

https://github.com/IbrahimTanyalcin/camToMP4

MIT License, logo and comments by chatGPT

https://redd.it/13pm9x6
@r_bash

solaris 10 cron failed command substitution.

0,20,40 * * * bash -c -l /usr/local/monitors/lp_mon2

\#!/bin/bash



\#grab oldest file from queue

stuff=\`ls -1 /var/spool/lp/requests/localhost/ | /usr/bin/head -1\`

\#pull printer name from lp requests (first line in file)

puff=\`cat $stuff | /usr/bin/head -1 | sed -e 's/-.*//' -e 's/$/ is having issues printing from /'\`



if [ "$(ls -A /var/spool/lp/requests/localhost/)" ]

then

echo $puff | /usr/ucb/mail foo@bar.com
else

echo lp queue is empty | /usr/ucb/mail foo@bar.com

fi

Also tried:

stuff="(ls -1 /var/spool/lp/requests/localhost/ | /usr/bin/head -1)"


puff="$(cat $stuff | /usr/bin/head -1 | sed -e 's/-.*//' -e 's/$/ is having issues printing

Suggestions??

https://redd.it/13pq6d3
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how to prevent this variable form becoming equal to when directory is empty

list=$(for f in "$dir"/\ ; do printf '%s\\n' "$(basename $f)" ; done )

works as expected when the directory is not empty but when it's empty, it becomes equal to * and I want it to become an empty string if the directory is empty

https://redd.it/13q28rv
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the case for bash
https://www.neversaw.us/2021/04/02/the-case-for-bash/

https://redd.it/13ql14n
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Simple file path opening code

I’m as new as you can get to using bash and was trying to make a little code to make some of my work tasks easier. I’ve just been saving a .txt file as .bat and double clicking when I need to use it.

I figured out how to use explorer to open the file path I want, but now I want it to be a little smarter. Say I have the file path:

T:\Files\Reports

I figured how to open it using “explorer” but now I want to add the month after and have it change to the current month accordingly. For example, this month would be:

explorer T:\Files\Reports\04

I have found multiple things online on how to get current date and how to concatenate strings, but “explorer” doesn’t seem to accept a variable as a useable path. I’m not sure about many of the rules of bash code and all it’s intricacies, so I was hoping someone here could help me. Thanks!!

https://redd.it/13qoinl
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Script not working like we had envisioned it working

I've been working with ChatGPT to create a noscript that iterates through my entire music library, looking for filenames that are like "<##> - <Artist> - <Title>", and renaming them as "<##> <Title>". I still need to add a couple conventions, like "<##>. <Artist> - <Title>" and such, but the problem is that it's currently not doing what it should, leaving filenames as "<##> - <Title>" or just leaving the filename completely unchanged. It's also supposed to add a leading zero to the track number in the filename if it's 's a single digit. It's not doing that, either. We've been working at this for a couple hours trying to figure out why it's not doing the thing. Here's the noscript. Edit: Forgot to "ask a question", so, Can you help me? Edit 2: Oh, by the way, I know the music_library path is set to '/path/to/music/library' I do have it set properly on my system. Edit 3: left out a bit of what it's supposed to do.

https://redd.it/13qq0wr
@r_bash

Two-Way File <-> FileList Check

Hello, this bash noscript will loop through lines of files from FileList.txt and check if a directory contains such file... Now I want to do it the other way, loop through a directory and check if filename exists in the FileList.txt . How do I do it? Files may contain special characters...

#!/usr/bin/env bash
#Check Files in list from file exist or doesn't exist in directory.

if $# -eq 0 || $# -eq 1
then
echo "You must pass the path to file with the list and the path to directory to check files. \nsh check-file-exist-from-list.sh path/to/file path/to/directory"
exit 1
fi

while read -r file; do
if -e "$2/$file" ; then
echo "$file exists in $2"
else
echo "$file doesn't exist in $2"
fi
done < "$1"

https://redd.it/13qwd06
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I have a weird Syntax error near unexpected token ")"

I can't remember what I was trying to do, I think I modified something in JAVA_HOME and since then I broke everything.

Brew doesn't work anymore, the custom color scheme I had for the terminal is gone and I always get this error

&#x200B;

https://preview.redd.it/grw8emfl8u1b1.png?width=1884&format=png&auto=webp&v=enabled&s=16b1fae9a35417301bcba8c9f2301b4cdc9672bd

It says there is an unexpected token ) in line 1, but there's none there

&#x200B;

https://preview.redd.it/128o2qaq8u1b1.png?width=1972&format=png&auto=webp&v=enabled&s=7da6270a482d9077cae6ec3aee0875405ba46b1e

As you can see here. I am a complete noob with bash and I had a friend set up brew and other neat tools for me, I tried to find a solution myself for days, but I can't for the life of me understand what is going on.. can someone help me?

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Calculate space savings from deduplicating with hardlinks (using find, sort/uniq, and awk)
https://gist.github.com/Sidneys1/d726c2a59f2dcb1be9dfce2dfae0a042

https://redd.it/13r0hji
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trying to number a variable. 1. causing an error 2. I don't know if this is the best way to do it

evalWithNum(){
i=1
listWithNum=$(while read line
do
printf '%d. %s' "$i" ""$line""
i=$((i+1))
done < "$list"
)
unset i
}

"$list" is

a

b

c

&#x200B;

the error is

cannot open a
b
c: No such file

https://redd.it/13r29fw
@r_bash

while loop skips steps?

I have a text file that has variable data a space then a path to a file.

DATA ./path/to/file

This is repeated several dozen times. I am trying to convert mkv files to mp4.


I then have the following code:


#!/bin/bash

if [ -z $1 ]
then
echo "Usage:"
echo
echo '$ ./mkv2mp4.sh "Title.of.TV.Show" file.list "1080p.h264"'
echo
echo "Where file.list is a space seperated file format as:"
echo
echo "S01E01 ./path/to/episode1.mkv"
exit
else
filelist=$2
extras=$3
shownoscript=$1
declare -a array
fi

while read -r mkvfile
do
array=( $mkvfile )
echo "Read from: ${array1}" >> mkv2mp4.log
echo "Write to: $shownoscript.${array0}.$extras.mp4" >> mkv2mp4.log
echo "Read from: ${array1}"
echo "Write to: $shownoscript.${array0}.$extras.mp4"
echo "Start: $( date )" >> mkv2mp4.log
#sleep 1s
ffmpeg -i "${array1}" -c:v copy -c:a aac "$shownoscript.${array0}.$extras.mp4"
echo "Done..."
sleep 1s
echo "Finish: $( date )" >> mkv2mp4.log
done < $filelist


If I run it, it gets to the end of the first video, then it skips almost the entire list and proceeds with one of the last videos in the list. If I comment out the ffmpeg line, it doesn't skip anything.


Any help would be appreciated.

https://redd.it/13rng0x
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Detecting Chinese characters using grep

I'm writing a noscript that automatically translates filenames and renames them in English. The languages I deal with on a daily basis are Arabic, Russian, and Chinese. Arabic and Russian are easy enough:

orig_name="$1"
echo "$orig_name" | grep -q "[ابتثجحخدذرزسشصضطظعغفقكلمنهويأءؤ]" && detected_lang=ar
echo "$orig_name" | grep -qi "[йцукенгшщзхъфывапролджэячсмитьбю]" && detected_lang=ru

I can see that this is a very brute-force method and better methods surely exist, but it works, and I know of no other. However, Chinese is a problem: I can't list tens of thousands of characters inside grep unless I want the noscript to be massive. How do I do this?

https://redd.it/13rqfjd
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Need a firebase tools passthrough noscript

Unabasheldy asking....
Can someone help me figure out resources how to...,to write a passthrough noscript..not a bash noscripter..but I need one...if you have a fiverr let me know.


So simple thing...I want the user of my noscript (mostly me) ....to run a certain command before running the command with the arguments passed to it...in this case the command is "firebase deploy"...and it usually is something like "firebase deploy --only firestore:rules"

Problem is that sometimes my configuration is in the wrong environment.


There is another command I can use to get the current project...
"echo $(firebase use)"


So I want to run my noscript ..lacking a name...lets just call it "kissanddeploy" like this "kissanddeploy --only firestore:rules"

I want it to run..."echo $(firebase use)"
which should output "dev-foobar" or "prd-foobar"...if the name includes "prd-" in the response...I want to ask the user...


"Are you sure you want to deploy to production?"


...and a Y/N answer before itʻll execute the command passed into it from the CLI...if "N" is answered then it exits. Otherwise it executes whatever was after...like "firebase deploy --only firestore:rules"


Long story short...I accidently deployed to production when I meant to deploy to dev...and it had the potential to break something big...and I do not want that happening ever again..

Anyone wrote a passthrough noscript like this I could take a look at?


Thank you.

https://redd.it/13rw7ya
@r_bash

Environment set-up problems with bash (ros2iron)

Hello! I am very new to this, and this seems like a extremely trivial problem, but I have no idea how to fix it. I am following the steps to build ros2\iron from source on Ubuntu, everything worked great until the final step, where I have to set up the environment. The tutorial gives this command:

. \~/ros2_iron/install/local_setup.bash

I checked, the file is there, everything looks good. But, when i run that command instead of taking me to that directory to get the local_setup.bash file, it takes me here:

"/home/parallels/ros2_iron/install/rosbag2_transport/share/rosbag2_transport/local_setup.bash" so its looking for it in in the wrong place. I am new to bash and ros in general, so I really don’t know why when I explicitly type in the path where it must find the file, it looks for the file a couple of folders deeper. I have tried removing the contents from my .bashrc and .profile files, as I thought maybe there was some path variable that it was following, but that did not help. I am at a loss. Again i know this is likely a very trivial error, but I have no clue how to solve it, so any input would be greatly appreciated!! :)

Also I am running Ubuntu 22.04 ARM64 on a Mac through Parallels.

https://redd.it/13s8615
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Speed up inter process communication

Inspired by this post by u/jkool702, I am interested in ways to speed up inter process communication in which a process reads from an anonymous FIFO to receive messages at a rate of around 10-40Hz from other processes. The context is here:

https://github.com/lynxthecat/cake-autorate/blob/16f6c467b2f3faeff935c6d0ccfa23a53eeeaba3/cake-autorate.sh#L1877

Right now each read is byte-by-byte, and I gather one way to overcome that would be to use fixed width writes and read using -N.

Any other ideas?

u/jkool702 you indicated that you ended up writing to files and using 'cat'. Would that work in the above context in which I need to read lines at around 10-40Hz?

https://redd.it/13sgo9y
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best way to read settings from a file?

One of the noscripts I am making, I am going to put the settings in a seperate file that the user can modify. But what is the best way to get the settings into the main noscript: Grep? Awk and Line numbers?

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@r_bash