LinuxQuestions.org - [SOLVED] How to create a variable from a command that increments the folder name?

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How to create a variable from a command that increments the folder name?

Hello

I am using this code and is working as expected....

Code:

# Increment $N as long as a directory with that name exists

while [[ -d "/backup/$DOMAIN/$DATE/database/inc$N" ]] ; do

    N=$(($N+1))

done



if ls -A $TARGETDIR/* > /dev/null 2>&1; then

    mkdir -p "/backup/$DOMAIN/$DATE/database/inc$N"

fi

When the $TARGETDIR is not empty it creates a folder and increase it by 1 every time the script runs like:

Quote:

/backup/$DOMAIN/$DATE/database/inc1
/backup/$DOMAIN/$DATE/database/inc2
/backup/$DOMAIN/$DATE/database/inc3

On the above code i want to run a command that needs the destination path like:

Code:

backup bla bla bla --target-dir /backup/to/dir

How should i know the created folder every time the script runs if it is inc1 or inc4 and create a variable from this command when it runs?

Code:

mkdir -p "/backup/$DOMAIN/$DATE/database/inc$N"

Thank you

Save the directory name as a variable then make it.

Code:

mydir="/backup/$DOMAIN/$DATE/database/inc$N"

mkdir -p -- "$mydir"

Code:

mydir="/backup/$DOMAIN/$DATE/database/inc$N"

msg=$(mkdir -p -- "$mydir" 2>&1)

echo "$msg"

You need to quote your variables.

Code:

a=cats

echo "I like "$a""

I almost understand what you are trying to say, I think.
you have a script that creates dirs and adds 1 for each new sud-dir it created.
when you then backup you want to know where to start or left off so you can pick up from there?

You're going to need to look first to see where you're at then set it from where you left off at. Using your $N value.

you should already know your values within your variables.

Code:

/backup/$DOMAIN/$DATE/database/inc$N"

do a search on it, putting them in a file then sort them, get the value left off at, so now you can pick up from there?

that $DATE might mess you up, if it is using current date.
/backup/$DOMAIN/*/database/inc$N"

Code:

find /backup/$DOMAIN/*/database/inc* -type d >> ckfile

or

find find /backup/$DOMAIN/*/database -type d >> ckfile

check last entry to get number left off at, then use that to start your incurrent.
--
just straight forward create incremented dir, check them, get number I left off at.

Code:

#!/usr/bin/env bash



dododir=$HOME/test/$(date)/backup

N=0

for i in {1..15} ; do

 mkdir -pv "$dododir"/inc"$N"

        ((N++))

done

#create list of dirs already created

find "$HOME"/test/*/backup -type d >> ~/testscripts/ckleftoff



echo

#get last line in the file, to get number left off at

lastline=$(awk '/./{line=$0} END{print line}' ~/testscripts/ckleftoff)



#working example of what dir structure looks like



#/home/userx/test/Sat Aug 31 13:07:24 CDT 2019/backup/inc14



#strip everything off left to right up to last /

lastline=${lastline##*/}



#get the number off the tail piece inc$N

lastline=$(echo -e $lastline | egrep -o [0-9]+ )



#number of where to pick up from needs +1

echo;echo $lastline

Ok i got it working !!!!

Thanks all of you !

Code:

#!/bin/bash

Dir="$1"

Dirs=(${dir}*) # put all the dirs into array

# it no dir exist, the one element will be the base dir

DirCount=${#Dir[@]}

#mkdir -p "${dir}$(( ${DirCount} + 1 ))"

# fix typo

mkdir -p "${Dir}$(( ${DirCount} + 1 ))"

That makes some lazy assumptions , e.g.
on filesystem you have
/path/to/some/directory1
/path/to/some/dir1

./script.sh /path/to/some/dir
will make /path/to/some/dir3

safer

Code:

#!/bin/bash

Dir="$1"

Dirs=()

for i in ${Dir}*;do

    [[ ${i} =~ ${Dir}[0-9]+ ]] && Dirs+=("${i}")

done



#mkdir -vp "${dir}$(( ${#Dirs[@]} + 1 ))"

# fix typo

mkdir -vp "${Dir}$(( ${#Dirs[@]} + 1 ))"

The danger with that one is
/path/to/some/directory1
/path/to/some/dir1
/path/to/some/dir3

will just remake /path/to/some/dir3
because 2 + 1 = 3

PS

Code:

lastline=$(echo -e $lastline | egrep -o [0-9]+ )

# no need for echo

lastline=$(<<<$lastline egrep -o [0-9]+ )

fixed typo ( dir should be Dir )

also wanted to point out that the script would break if passed a dir ending /

e.g.
./script.sh /path/to/dir/

a fix would be

Code:

Dir="${1%/}"

the %/ removes the trailing /

https://www.tldp.org/LDP/abs/html/pa...stitution.html