To merge multiple pdf files using the most current qpdf (instead of the older pdftk) you can use the following:
qpdf --empty --pages file1.pdf file2.pdf file3.pdf -- output.pdfMerge multiple pdf documents using qpdf
Reply
Category Archives: linux
Managing print jobs in linux command line
Some useful commands to manage print jobs
| lpstat -p -d | To get a list of available printers, along with their status |
| lpstat -a | To check the status of all connected printers, including job numbers |
| cancel job-id or lprm job-id | To cancel a print job |
| lpmove job-id newprinter | To move a print job to new printer |
Taken from Introduction to Linux course (LFS101) from Linux Foundation here
Get the monitor resolution in linux command line
You can use the following xdpyinfo command
xdpyinfo | grep dim
dimensions: 3840x3673 pixels (1016x971 millimeters)
Displaying the IP address of a gitlab runner in a Gitlab job
To be able to see the job runner IP address in a gitlab job, you can add a script (or add it to an existing one) that uses hostname -I
script:
- hostname -I && your_other_scriptProducing a file C.txt that contains common lines between A.txt B.txt using grep
Problem
You have two files (A.txt, B.txt) that contain records (one line each), and you want to find out the common lines between the two.
For example you have the following two files.
A.txt
one
two
threeand B.txt
two
six
sevenand you want to find or produce a new file (C.txt) that contains only the common record (two) from the two files.
Solution
You can use grep with the -Fx options like
grep -Fxf A.txt B.txt > C.txtthat will produce file C.txt that contains the common line (two) from the two files.
The options for grep have the following meaning:
-F: Interpret the pattern as a list of fixed strings (instead of regular expressions).-x: Only match whole lines.-f fileA.txt: Read the patterns fromfileA.txt.
Changing mail sending from command line from mail(x) to s-nail
Problem
It seems that the default email client in Fedora 40 is s-nail instead of mailx in Fedora 39, and trying to send an email from the command line does not work anymore.
Solution
The two changes required in order for the command to work with s-nail are:
- Use spaces instead of commas in the recipients, and/or in the cc_recipients lists
- When you use attachments (-a flag) and cc_recipients (-c flag), the -a flag should be before the -c flag, otherwise:
s-nail: -a is an invalid alias name
So the full command can be like the following:
echo $body | mail -s "Reports for $yesterday" -a $report_path_a -a $report_path_b -c $cc_recipients $recipients
Convert xlsx to csv using libreoffice in command line
To convert an xlsx file to csv in command line, you can use the following if you have libreoffice installed
libreoffice --headless --convert-to csv file.xlsx
Convert epub file to pdf in Linux CLI
If you would like to convert an epub file to pdf in Linux, you can use calibre.
First install it using
sudo apt-get install calibreand then you should be able to use it to convert the file like
ebook-convert file.epub file.pdfKey is stored in legacy trusted.gpg keyring
As described in the post [here](https://itsfoss.com/key-is-stored-in-legacy-trusted-gpg/) you would need to export the key to its own file under the trusted.gpg.d directory.
So for example if the warning is for something like forticlient, first find the key using sudo apt-key gpg list and then taking the last eight characters and removing the space, export the key to its file (ie forticlient.gpg)
sudo apt-key export 5E54716D | sudo gpg --dearmour -o /etc/apt/trusted.gpg.d/forticlient.gpg
Linux sort files by human readable size
To sort the files in a directory use the following
du -sh -- * | sort -hTaken from https://unix.stackexchange.com/a/4682