3.8 KiB
bash commands
- work in bash tutorial
- Execute stuffs
- Show command history
- Devices
- List process
- 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
Convert pdf to text or html using poppler
Use poppler and redirect the text to a org file.
pdftotext
converts a pdf to "txt" if no other format is
specified
pdftotext foo.pdf foo
pacman -S poppler pdftotext foo.pdf ->> foo.org # first option pdftotext foo.pdf foo.org # second option
Convert pdf to html
pfdftohtml foo.pdf foo.html
Convert files using pandoc
Use pandoc with "-s" flag to produce a standalone document and "-o" to redirect output to a file.
In the example a file "foo" is converted from odt
to org
pandoc -s -o foo.org foo.odt
Convert files to pdf using libreoffice
Convert odt file "tcl_online3.odt" to pdf
libreoffice --headless --convert-to pdf tcl_online3.odt
Display files
Show content of a file. Concatenates and writes file. Using "tac" reverses the result of "cat" command
cat file.txt
Using head, tail and less to show parts of files
Showing the first two entries
head -n 2 /etc/hosts
127.0.0.1 | localhost |
127.0.1.1 | myuser |
Showing the last two entries
tail -n 2 /etc/hosts
ff02::1 | ip6-allnodes |
ff02::2 | ip6-allrouters |
less /etc/hosts
127.0.0.1 | localhost | ||
127.0.1.1 | myuser | ||
::1 | localhost | ip6-localhost | ip6-loopback |
ff02::1 | ip6-allnodes | ||
ff02::2 | ip6-allrouters |
Show content of a zip file using less and pipe "|"
unzip -l tntvillage_484094.zip | less
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
List process
Use ps
, top
or htop
to list process:
ps
reports a snapshot of the current process
ps aux | less
top
display dynamic real-time view of linux process
top
htop
displays an interactive process viewer
htop
To kill a process use:
kill [PID]
or
pkill [PID]
PID = process identificator
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