bash-tutorial/doc/bash_tutorial.org

bash commands

• work in bash tutorial
• Execute stuffs
• Show command history
  • Backup a file
  • Simple code to encrypt
  • Download files
• Devices
• Evaluate time to load
• Cool commands
• References:

DONE work in bash tutorial

CLOCK: [2021-09-08 mié 18:52]–[2021-09-08 mié 19:22] => 0:30 CLOCK: [2021-09-04 sáb 16:04]–[2021-09-04 sáb 16:34] => 0:30 CLOCK: [2021-09-04 sáb 15:19]–[2021-09-04 sáb 15:49] => 0:30

Execute stuffs

Show command history

history

The file can be found in the user home:

/home/user/.bash_history

Backup a file

Using "cp"

cp bbdb{,.bak}

bbdb.bak

Backups with tar (tape archiver)

Back up of "home"

• c = create file
• v = verbose
• f = write to a file/device
• z = compress the file (gzip) "tar.bz"
• j = compress the file (bzip2)

tar -czvf /tmp/home.tar.gz /home

Simple code to encrypt

Encrypt:

gpg -c X
gpg X

Use the code to remove the original file:

shred --remove X

Download files

This code download the file and the argument -O is to rename the file

wget https://filetodownload.org -O new_file

Devices

• mount /what /where

  • what = device name

  • where = directory

    • /mnt = devices that mount occasionally
    • /media = devices that mount frequently

run/$USER/media/$LABEL

Evaluate time to load

In emacs:

time emacs --eval '(save-buffers-kill-terminal)'

Cool commands

cal # calendar
clear # clear output
uname # display system information (-r, -p, -a)
wc # wordcount (file name)
date # check the date

References:

• The bash hackers wiki
• Beginning the linux command line
• Pandoc manual
• stackoverflow