commands

$ ./01
$ ls -l 01
$ chmod u+x 01
$ chmod u-x 01
$ chmod a+x 01
$ cat notka.txt
$ PATH=$PATH:~/Pulpit/shell
$ PATH=$PATH:~/workspace/Bash-Shell-Scripting
Shebang: #!/bin/bash
Shebang: #!/usr/bin/env bash
$ type ls
$ type 02
$ man read
$ help read

# debugowanie:
#!/bin/bash -x
# set -x
# set +x

$ if mkdir a; then echo "ok"; else echo "error"; fi
$ help if

$ checking="witaj"
$ echo $checking, $USER
$ opakowane="$checking, $USER"
$ echo $opakowane

$ filename="check.txt"
$ echo $filename
$ touch $filename
$ filenames="check check2"
$ touch $filenames
$ ls -l $filenames

$ export EDITOR=vim
$ help test

# output zapisany do pliku out_file
$ 04_conditions > out_file

# dane do read wprowadzone z pliku in_file
$ 04_conditions < in_file

$ touch {a..d}.mdt