Newbie question

https://redd.it/y6qnas
@r_bash

help: delete largest duplicate file

Hi everyone, I'm struggling with a little bash noscript this morning and while I often like to experiment and find it myself, I'm stuck.

I have a directory that contains about 1k video files. Each file is duplicated and have different encodings and frame sizes. Since it's for archival I only want to keep the smallest file for each video.

Both duplicates of a file have the same name until the last 16 characters which are a random string of characters/timestamp. And the extensions are inconsistent.

I can list all files, ordered by name which places the duplicates next to each other, but then how do i find the one with the largest filesize and delete that one?
Also i can't just go though the list 2 by 2 because not 100% of the files have a duplicate. But I can't think of another way to traverse the file list with my current skillset.

I'm a beginner at bash, have only written 4-5 complex noscripts and that was while constantly looking at basic documentation just to get a ''if statement'' syntax right. So any help would be greatly appreciated.

https://redd.it/y70r7j
@r_bash

Bash help

I need urgent help with bash for an upcoming assessment. I usually wouldn't ask help but I've no clue how bash works. If anyone can help please dm

https://redd.it/y753m9
@r_bash

Problem with handling with datetimes in Bash

I'm quite new to bash noscripting, and test in general. I'm writing a noscript to automatically update Docker images, when I get this error:

/home/misery/update-images.sh: line 31: [[: 2022-10-07T02: value too great for base (error token is "07T02")

Before I call test, I logged the timestamp I extract from the Docker API:

Remote image created on 2022-10-07T02:22:37
                        ^^^^^^^^^^^^^^^^^^^
                        In a variable called 'remoteImage'

For debugging purposes, I tried echoing localImage too:

"2022-10-07T02:22:37

Yet why am I getting an error in line 31?

Here's the code where I do an if

if [[ "$remoteImage" -eq "${localImage:1}" ]]; then
 echo $image is outdated!
else
 echo $image is up-to-date
fi

https://redd.it/y78wln
@r_bash

What is this local and where I can learn more

Is this maybe obsolete?




pause(){

local message="$@"

[ -z $message ] && message="Press Enter key to continue..."


read -p "$message" readEnterKey
}

https://redd.it/y7afy6
@r_bash

Newbie question, How do I convert a string to numeric

For example.

$username =?

Im trying to give each user a UID that matches to the numaric value of its name.

Any help will be appricated

https://redd.it/y7e7uo
@r_bash

Help: I need the equivalent bash line of this PowerShell noscript

dir -exclude old_a | %{git mv $_.Name old_a}

from https://stackoverflow.com/a/14470212

https://redd.it/y7hahk
@r_bash

Error during a noscript, but running fine when doing it manually.

In my noscript I have a line which goes

read -s password

When I execute the noscript it gives me an error "read: illegal option -s"

But when I type it manually into the terminal it works fine. I tried running the noscript as sudo didn't solve it.
Any help would be appricated.

https://redd.it/y7kabe
@r_bash

Check if a string match given name together with a arimetic expression in one line.

I have this Script which compares numbers.
to see if they are between or equal to a set of Numbers.

And in the end of the noscript i would also like to
add variable b to compare to see if variable b
is equal to the "hello" string

/tmp/numbers.txt

9 #c

2 #d

19 #body

2022-10-18 23:17 #time1

Hello #hello string which i want to compare if it exists.

exec 4</tmp/numbers.txt
IFS= read -ru4 body #body
IFS= read -ru4 c
IFS= read -ru4 d
IFS= read -ru4 time1
IFS= read -ru4 b
exec 4<&-

if (( c >= 7 && c<= 10 && d >= 0 && d <= 3 && body >= 18 && body <= 20 && b == "Hello")); then
echo "Hello parameter exists"
fi


I know that if you want to compare strings you have to use the []

But what if i want for conveince to compare it inside the (()) expression.

https://redd.it/y7jgsu
@r_bash

Help to nodify bash noscript

\#!/bin/bash

riclist=(

''

)

\#Message depends on riclist ID

declare -A rcmsg

rcmsg[\]=''

\# Raw log filename

RAWSTAMP="$(date '+%Y_%m_%d')"

RAWLOG="raw_$RAWSTAMP.log"

while IFS='' read -r line; do

\# check for all strings in $riclist

# Raw logging

echo "\\date '+%Y-%m-%d %T'` $line" >> $RAWLOG`

double_filter="$double_filter"

double_filter2="$double_filter2"

double_filter3="$double_filter3"

double_filter4="$double_filter4"

count=0

while [ "${riclist[count\]}" != "" \]; do

if [ "${line/${riclist[count]}}" != "$line" ] ; then # if $line minus first apperence of $riclist is diffrent from $line

if [ "${line##*Alpha: }" != "$double_filter4" ] ; then double_filter4="$double_filter3"

if [ "${line##*Alpha: }" != "$double_filter3" ] ; then double_filter3="$double_filter2"

if [ "${line##*Alpha: }" != "$double_filter2" ] ; then double_filter2="$double_filter"

if [ "${line##*Alpha: }" != "$double_filter" ] ; then

&#x200B;

TIMESTAMP="$(date '+%Y-%m-%d %T')"

TIMESTAMP2="$(date '+%Y-%m-%d %T')"

id=${riclist[count\]}

RAW="${line##*Alpha: }"

RAW2="${line##*Alpha: }"

NOTNUL="$( echo "$RAW" | sed --regexp-extended 's/<(CR|NUL)>//g; s/<(LF|SYN)>/\\ /g' )"

NOTNUL2="$( echo "$RAW2" | sed --regexp-extended 's/<(CR|NUL)>//g; s/<(LF|SYN)>/\\ /g' )"

ADDBOT="$NOTNUL - ${rcmsg[$id\]}"

ADDBOT2="$NOTNUL2 - ${rcmsg[$id\]}"

echo "$TIMESTAMP2 $ADDBOT2" | mail -s "$TIMESTAMP $ADDBOT" mail@mail

&#x200B;

printf -v filename "rtj_\\date +%Y_%m_%d`.log"`

echo "\\date '+%Y-%m-%d %T'` ${line##*Alpha: }" >> $filename`

double_filter="${line##*Alpha: }"

fi

fi

fi

fi

fi

count=$(( $count + 1 ))

done

done

The best solution to not send an email if ${line##*Alpha: } contain specific words in this noscript. How would you do it?

https://redd.it/y7t4qb
@r_bash

remove the character before a specific string or append contents of a file to another file without adding a newline character after?

im trying to write a noscript to auto update an avahi service whenever a program on another pc changes the port it is listening on and restart the daemon - and i'm almost there. i have gotten batch files monitoring and updating a file with the current ports on the windows pc, i network shared the file with the ports

#!/bin.sh
echo "<?xml version=\\"1.0\\" standalone=\\'no\\'?><!--\*-nxml-\*-->\n<!DOCTYPE service-group SYSTEM \\"avahi-service.dtd\\">" > /etc/avahi/services/oculus.service
echo -n "<service-group>\n<name replace-wildcards=\"yes\">oculus</name>\n<service>\n<service protocol=\"ipv4\">\n<type>_oculusal_sp._tcp</type>\n<port>" >> /etc/avahi/services/oculus.service
tail --lines 1 /mnt/win_share/port.txt | cut -d\n -f1 >> /etc/avahi/services/oculus.service
echo -n "</port>\n<host-name>vr-pc.local</host-name>\n</service>\n</service-group>\n" >> /etc/avahi/services/oculus.service
service avahi-daemon restart

outputs the following

<?xml version="1.0" standalone=\\'no\\'?><!--\*-nxml-\*-->
<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
<service-group>
<name replace-wildcards="yes">oculus</name>
<service>
<service protocol="ipv4">
<type>_oculusal_sp._tcp</type>
<port>56199
</port>
<host-name>vr-pc.local</host-name>
</service>
</service-group>

i need it to say <port>56199</port>

instead of

<port>56199

</port>


&#x200B;

ive tried a bunch of different ways to do it and i just cant figure it out. someone help?

https://redd.it/y7uq18
@r_bash

Send signal to itself

My noscript:

trap "rm -rf '$CACHE'; exit 1" 15
my_program || kill -15 "$$"

Does this work? I want to exit my noscript if my program fails, but also delete the temp directory before the noscript exits.

Also I am talking about posix dash noscripting and not bash noscripting.

Thank you

https://redd.it/y7xqc4
@r_bash

Script for volup/voldown/mute

Hi everyone

I have error with my volup/voldown/mute noscript so any help is welcome

inc='10'
activesink=`pacmd list-sinks |awk '/* index:/{print $3}'`

case "$1" in
up)
exec pactl set-sink-volume ${activesink} +${inc}%
;;
down)
exec pactl set-sink-volume ${activesink} -${inc}%
;;
mute)
exec pactl set-sink-volume ${activesink} toggle%
;;
esac

When run i get these errors

: not found: 3:
pavolume.sh: 4: Syntax error: word unexpected (expecting "in")


Thanks in advanced

https://redd.it/y89mjb
@r_bash

Learning noscripting, but code seems to work depending on how I call it

So as the noscript suggests, I am trying to learn noscripting with BASH. I find that when I run my noscript as:

'bash iftesting.sh'

\- it runs perfectly.

However, when I run it as:

'./iftesting.sh'

\- it results in the error 'iftesting.sh: 6: [[: not found

Is running it from './' wrong or different in some way? Again, this is all new to me, thanks!

https://redd.it/y8cf2j
@r_bash

Access items in JSON using Bash

I have a json structure similar to the following (created using the AWS CLI)



[
{
"Instance":"10.120.100.234",
"Name":"Server A"
}
,

{
"Instance":"10.120.101.210",
"Name":"Server B"
}
,

{
"Instance":"10.120.100.175",
"Name":"Server C"
}

]

If I have this in a variable ($OUTPUT, for example), how can I access each item in turn? I need to run a command on each server in turn, then write a line with the server name and instance IP (and return status of the command) on it.


I'm working in bash, jq is available, and I could (if I needed to) write/run this in python also; whichever gives me the quickest way forward.

https://redd.it/y8bih3
@r_bash

Timeout command not killing Python noscript

Hey there,

I have a Python noscript that I need to kill after it's been running for 10 seconds.

I've tried both of the following commands but it doesn't kill the process for some reason I can't diagnose:

timeout 10 python example.py
timeout --kill-after=10 10 example.py

Thanks for your help.

https://redd.it/y8osfi
@r_bash

getting the month number by the month name

Hello, folks. I need your help. Is there a native method for getting the month number by the month name? for example: <some command> May. Answer 5.

https://redd.it/y8pnes
@r_bash

My ebook 'Linux Command-Line Tips & Tricks' has been made free
https://old.reddit.com/r/FreeEBOOKS/comments/y8uwpf/linux_commandline_tips_tricks_free_on_all_ebook/it1ydse/

https://redd.it/y8wnkm
@r_bash

Newbie question. How to extract the first columm of a line containing a range of values?

Im trying to grep or awk the first word of each line that contains value between 1000-6000

I managed to extract the value it self or the first value of every columm regardless of value, but can't manage to do both at once.

https://redd.it/y8yibd
@r_bash