When writing a Bash script you can use brace expansion to quickly generate lists: What is the simplest way to generate a similar list in Powershell? I can use the .. or , operators to generate a...

I'd like to generate all permutations of letters up to length n For example, for the argument 2 I'd like obtain a list like a aa .. az ... z za .. zz I tried using a for loop to generate n increa...

Given this very simple Makefile: all: @mkdir -pv test/{a,b} I get this output on OS X 10.6.8 and CentOS 5.5: mkdir: created directory `test' mkdir: created directory `test/a' mkdir: created di...

I'm running the following RUN command in my Dockerfile, expecting a "logs" directory to be created under each of the listed subdirectories: RUN mkdir -p /opt/seagull/{diameter-env,h248-env,http-en...

I am working on a very simple bash script and I'm having a problem with understating why deprecated $[] is working flawlessly, while $(()) seems to break the whole thing. The code I'm referring to...

I just wanted to know what is the difference between: echo {$number1..$number2} AND eval echo {$number1..$number2} Of course, imagine that there is a value in $number1 and $number2. With the fi...

I saw the following code in Bash shell Decimal to Binary conversion and I was wondering how it works? I tried googling with no avail. D2B=({0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}) echo $...

I have four files: 1.txt 2.txt 3.txt 4.txt in linux shell, I could use : ls {1..4}.txt to list all the four files but if I set two variables : var1=1 and var2=4, how to list the four files...

Bash allows me to write the statement, $ for i in {h..k} ; do echo $i ; done but zsh only allows number list expansion such as {8..13}. What's the best workaround? Something like seq for charac...

Here is myscript.sh #!/bin/bash for i in {1..$1}; do echo $1 $i; done If I run myscript.sh 3 the output is 3 {1..3} instead of 3 1 3 2 3 3 Clearly $3 contains the right value, so why does...

When I needed to run a command multiple times with a different argument I used this approach (without understanding it fully): touch {a,b,c} Which is equivalent of: touch a touch b touch c I ...

In bash, I can do the following $ echo bunny{1..6} bunny1 bunny2 bunny3 bunny4 bunny5 bunny6 Is there a way to achieve the same result in fish?

When using a POSIX shell, the following touch {quick,man,strong}ly expands to touch quickly manly strongly Which will touch the files quickly, manly, and strongly, but is it possible to dynam...

I want to do something like this in a bash script. I'm using bash 4.1.10. # rm -rf /some/path/{folder1,folder2,folder3} Works nicely (and as expected) from the shell itself. It deletes the 3 des...

WEEKS_TO_SAVE=4 mkdir -p weekly.{0..$WEEKS_TO_SAVE} gives me a folder called weekly.{0..4} Is there a secret to curly brace expansion while creating folders I'm missing?

I understood what brace expansion is. But I don't know where I use that. When do you use it? Please give me some convenient examples. Thanks.