All commands in order.sync-conflict-20250611-153036-FW436ZV

In order of when they are shown in the b09 slides

LS

ls command

pwd and cd

ls

ls -l prints more information ls -a prints dot files (i.e. it includes file starting with .)

cat

• Usually used to dump files
• One file by itself doesn’t really concatenate anything… lol
• But with many files it prints everything from them depending on their contents cat file1 file2 file3

less

lets you view a file (and you can scroll and things too wow!)

mkdir

lets you make a directory w/ the given parent path and the final directory name

mkdir ../newFolder

• This creates a folder in the same directory as the directory your program is in.
  • So mkdir understands that given your path and name, itll go to said path and create this new folder mkdir ./a/b/c/d does NOT work because the directory does not exist. (there is no a, b, or c to create d in)

cp (copy)

cp myfile newname Or cp file1 file2 newDirName To copy a directory (and its contents) you want to do it recursively with -R

mv (move)

Moves files to another directory mv myFile.txt ./myDirectory ./newDirectory

Also used to rename: mv myFile.txt nuclearWeaponCodes.txt

• You cannot rename more than 1 file at a time. Any more than 2 arguments implies you’re just tryna move files to another directory

rm and rmdir

• rmdir removes a directory, but they gotta be empty before you can delete them
• rm just deletes a files
  • You can recursively delete with rm -r and that will delete everything within a directory

Week 2-3

echo

”The print command” Takes a string and prints it out. if passed a variable or other expandable things, it will do expansion first before printing it out

By default, adds a new line to the very end of what you’ve echod. More than 1 spaces between arguments are ignored

• You can keep spaces with \ . Stack em with \ \ \ \ to get lots of spaces.

sh

Runs the script right after as a shell script (creates a shell instance) Different from the . dot command

shift

Shifts the “positional parameters” (the “arguments” as I say)

tr

todo This one always sucks. “Translate” or “Transform” or whatever

[ (test commands)

Test Commands

seq start end

returns a sequence form start to end i.e. seq 0 3 returns 0 1 2 3 line by line! #goes-in-cheat-sheet