How to merge multiple PDF files to a PDF on Linux?

convert seems works not very well when merging PDFs. The quality is low. Any other better methods to merge multiple PDF files to a single PDF on Linux? ghostscript works the best for me on merging PDFs: gs -q -sPAPERSIZE=letter -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress -sOutputFile=out.pdf in1.pdf in2.pdf in3.pdf merges in{1..3}.pdf to out.pdf. Answered by Eric […]

How to get files without certain strings in their files names (reverse of *string*) on Linux?

To get files with certain string in their file names, it is quite straightforward: ls *string* However, how to do the reverse one: how to get files without certain strings in their files names on Linux? You can get a list of file names by a combination of find and xargs as follows: find . […]

How to set replication factors for HDFS directories?

Is it possible to set the replication factor for specific directory in HDFS to be one that is different from the default replication factor? This should set the existing files’ replication factors but also new files created in the specific directory. This can simplify the administration. We can set the replication factor of /tmp/ to […]

How to find the number of files in each directories on Linux?

How to find the number of files in each sub-directories of a directory on Linux? For example, . ├── a19 ├── a8 ├── d2 ├── ecfddd └── t1 The number of sub-directories can be quite large. How to find the number of files in each sub-directories here? You can use this piece of script to […]

Get error message on usb2 stick – READ ONLY FILE SYSTEM. What should i do? – linux – SysTutorials QA

Cant read or write to files on usb stick or move or copy them. Could you provide the dmesg output? It will help to understand your question. Answered by Eric Z Ma. If it is formated on Windows, you may need to install the ntfs-3g package to write to the usb disk.