Linux commands with pdf

How to open a PDF file from terminal?

and the PDF file would be opened on preview or whatever my default viewer was. When I use it in the terminal in Ubuntu I get this error message:

Couldn't get a file descriptor referring to the console 

@Roland but mac claims to be a unix based system, so I assumed the terminal would behave the same atleast

You can use fbi (Linux frame buffer image viewer) apt-get -y install fbi fbgs arch.pdf man fbgs for color and resolutions.

13 Answers 13

Most desktop environments on modern systems (generic)

GNOME

( xxx = some file extension). With this command the default app for xxx will be invoked (for example evince if you want to open PDF).

Application-specific

So there is absolutely no way to view the text of a pdf file inside the terminal? With the pictures removed or converted to ASCII art?

when using evince your document closes after you close the terminal. xdg-open per the elmicha’s answer worked wll for me.

xdg-open works in Gnome, KDE, xfce, LXDE and perhaps on other desktops.

You can put an alias in your ~/.bash_aliases:

+1. This is what chrome for one uses. It supports URIS as well (e.g. xdg-open irc://. ). Pretty cool.

For all those lost Mac users in Ubuntu-land ..

Edit your .bashrc file, and add:

pdftotext -layout file2open.pdf - | more 

We can use this in text mode, ssh, etc.

If you want to view PDF within Terminal (Command Line Interface), try to use zathura .

Install Zathura sudo apt-get install zathura -y .

To view a PDF file just run => zathura /path/to/xxx.pdf

BTW: zathura requires X11 anyway, it doesn’t work on Servers with no X installed.

zathura doesn’t display in the current terminal (Gnome), but opens its own window? A GTK application?

if you have Document Viewer installed type the following command:

if it is not already installed you can install it firstly using the following command:

sudo apt-get install evince 

to open your file in open office.

The Z shell ( zsh ) has suffix based alias ( -s ), these allow you to set up a file association between a file extension like .jpg and a suitable application like xreader :

With an alias like that you just need to type the file name and hit ↵ Return , e.g.:

The zsh shell has suffix based alias (-s) these allow you to set up a file association between a file extension e.g. jpg and a suitable application say xnview

In Ubuntu 17.04 you case use this:

I personally use a shell script:

$ cat pdf #! /bin/bash gnome-open $

When you call pdf it will open all pdfs in the current directory, specify which pdf by supplying an argument. I have many directories containing but one pdf file (e.g. so many LaTeX directories) so only having to write pdf saves me quite some time and keystrokes.

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Linux Commands Cheat Sheet

Here in this cheat sheet, Linux commands are categorized into different sections according to its usage. It is designed with all the commands in a nice background color.

You will find both the pdf and image (png) format of the cheat sheet.

Cheat sheet

Download your Linux commands cheat sheet in pdf format and print the Linux command download cheat sheet in A4 size paper.

Please keep us posted if you have any suggestions or if you find any command that we missed out on.

1. System Based Commands

uname	Displays Linux system information
uname -r	Displays kernel release information
uptime	Displays how long the system has been running including load average
hostname	Shows the system hostname
hostname -i	Displays the IP address of the system
last reboot	Shows system reboot history
date	Displays current system date and time
timedatectl	Query and change the System clock
cal	Displays the current calendar month and day
w	Displays currently logged in users in the system
whoami	Displays who you are logged in as
finger username	Displays information about the user

2. Hardware Based Commands

dmesg	Displays bootup messages
cat /proc/cpuinfo	Displays more information about CPU e.g model, model name, cores, vendor id
cat /proc/meminfo	Displays more information about hardware memory e.g. Total and Free memory
lshw	Displays information about system’s hardware configuration
lsblk	Displays block devices related information
free -m	Displays free and used memory in the system (-m flag indicates memory in MB)
lspci -tv	Displays PCI devices in a tree-like diagram
lsusb -tv	Displays USB devices in a tree-like diagram
dmidecode	Displays hardware information from the BIOS
hdparm -i /dev/xda	Displays information about disk data
hdparm -tT /dev/xda	Conducts a read speed test on device xda
badblocks -s /dev/xda	Tests for unreadable blocks on disk

3. Users Management Commands

id	Displays the details of the active user e.g. uid, gid, and groups
last	Shows the last logins in the system
who	Shows who is logged in to the system
groupadd «admin»	Adds the group ‘admin’
adduser «Sam»	Adds user Sam
userdel «Sam»	Deletes user Sam
usermod	Used for changing / modifying user information

4. File Commands

ls -al	Lists files — both regular & hidden files and their permissions as well.
pwd	Displays the current directory file path
mkdir ‘directory_name’	Creates a new directory
rm file_name	Removes a file
rm -f filename	Forcefully removes a file
rm -r directory_name	Removes a directory recursively
rm -rf directory_name	Removes a directory forcefully and recursively
cp file1 file2	Copies the contents of file1 to file2
cp -r dir1 dir2	Recursively Copies dir1 to dir2. dir2 is created if it does not exist
mv file1 file2	Renames file1 to file2
ln -s /path/to/file_name link_name	Creates a symbolic link to file_name
touch file_name	Creates a new file
cat > file_name	Places standard input into a file
more file_name	Outputs the contents of a file
head file_name	Displays the first 10 lines of a file
tail file_name	Displays the last 10 lines of a file
gpg -c file_name	Encrypts a file
gpg file_name.gpg	Decrypts a file
wc	Prints the number of bytes, words and lines in a file
xargs	Executes commands from standard input

5. Process Related Commands

ps	Display currently active processes
ps aux | grep ‘telnet’	Searches for the id of the process ‘telnet’
pmap	Displays memory map of processes
top	Displays all running processes
kill pid	Terminates process with a given pid
killall proc	Kills / Terminates all processes named proc
pkill process-name	Sends a signal to a process with its name
bg	Resumes suspended jobs in the background
fg	Brings suspended jobs to the foreground
fg n	job n to the foreground
lsof	Lists files that are open by processes
renice 19 PID	makes a process run with very low priority
pgrep firefox	find Firefox process ID
pstree	visualizing processes in tree model

6. File Permission Commands

chmod octal filename	Change file permissions of the file to octal
Example
chmod 777 /data/test.c	Set rwx permissions to owner, group and everyone (everyone else who has access to the server)
chmod 755 /data/test.c	Set rwx to the owner and r_x to group and everyone
chmod 766 /data/test.c	Sets rwx for owner, rw for group and everyone
chown owner user-file	Change ownership of the file
chown owner-user:owner-group file_name	Change owner and group owner of the file
chown owner-user:owner-group directory	Change owner and group owner of the directory

7. Network Commands

ip addr show	Displays IP addresses and all the network interfaces
ip address add 192.168.0.1/24 dev eth0	Assigns IP address 192.168.0.1 to interface eth0
ifconfig	Displays IP addresses of all network interfaces
ping host	ping command sends an ICMP echo request to establish a connection to server / PC
whois domain	Retrieves more information about a domain name
dig domain	Retrieves DNS information about the domain
dig -x host	Performs reverse lookup on a domain
host google.com	Performs an IP lookup for the domain name
hostname -i	Displays local IP address
wget file_name	Downloads a file from an online source
netstat -pnltu	Displays all active listening ports

8. Compression/Archives Commands

tar -cf home.tar home	Creates archive file called ‘home.tar’ from file ‘home’
tar -xf files.tar	Extract archive file ‘files.tar’
tar -zcvf home.tar.gz source-folder	Creates gzipped tar archive file from the source folder
gzip file	Compression a file with .gz extension

9. Install Packages Commands

rpm -i pkg_name.rpm	Install an rpm package
rpm -e pkg_name	Removes an rpm package
dnf install pkg_name	Install package using dnf utility

10. Install Source (Compilation)

./configure	Checks your system for the required software needed to build the program. It will build the Makefile containing the instructions required to effectively build the project
make	It reads the Makefile to compile the program with the required operations. The process may take some time, depending on your system and the size of the program
make install	The command installs the binaries in the default/modified paths after the compilation

11. Search Commands

grep ‘pattern’ files	Search for a given pattern in files
grep -r pattern dir	Search recursively for a pattern in a given directory
locate file	Find all instances of the file
find /home/ -name «index»	Find file names that begin with ‘index’ in /home folder
find /home -size +10000k	Find files greater than 10000k in the home folder

12. Login Commands

ssh [email protected]	Securely connect to host as user
ssh -p port_number [email protected]	Securely connect to host using a specified port
ssh host	Securely connect to the system via SSH default port 22
telnet host	Connect to host via telnet default port 23

13. File Transfer Commands

scp file1.txt server2/tmp	Securely copy file1.txt to server2 in /tmp directory
rsync -a /home/apps /backup/	Synchronize contents in /home/apps directory with /backup directory

14. Disk Usage Commands

df -h	Displays free space on mounted systems
df -i	Displays free inodes on filesystems
fdisk -l	Shows disk partitions, sizes, and types
du -sh	Displays disk usage in the current directory in a human-readable format
findmnt	Displays target mount point for all filesystems
mount device-path mount-point	Mount a device

15. Directory Traverse Commands

cd ..	Move up one level in the directory tree structure
cd	Change directory to $HOME directory
cd /test	Change directory to /test directory

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About The Author

Bobbin Zachariah

Bobbin is a seasoned IT professional with over two decades of experience. He has excelled in roles such as a computer science instructor, Linux system engineer, and senior analyst. Currently, he thrives in DevOps environments, focusing on optimizing efficiency and delivery in AWS Cloud infrastructure. Bobbin holds certifications in RHEL, CCNA, and MCP, along with a Master’s degree in computer science. In his free time, he enjoys playing cricket, blogging, and immersing himself in the world of music.

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