linux - w3toppers.com

How can I setup & run PhantomJS on Ubuntu?

Guidouil’s answer put me on the right track. I had to add one additional symlink to /usr/bin/, and I did direct symlinks for all 3 – see below. I’m installing on Ubuntu server Natty Narwhal. This is exactly what I did. cd /usr/local/share sudo wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-1.9.7-linux-x86_64.tar.bz2 sudo tar xjf phantomjs-1.9.7-linux-x86_64.tar.bz2 sudo ln -s /usr/local/share/phantomjs-1.9.7-linux-x86_64/bin/phantomjs /usr/local/share/phantomjs … Read more

How do I rename all folders and files to lowercase on Linux?

Smaller still I quite like: rename ‘y/A-Z/a-z/’ * On case insensitive filesystems such as OS X’s HFS+, you will want to add the -f flag: rename -f ‘y/A-Z/a-z/’ *

When should we use mutex and when should we use semaphore

Here is how I remember when to use what – Semaphore: Use a semaphore when you (thread) want to sleep till some other thread tells you to wake up. Semaphore ‘down’ happens in one thread (producer) and semaphore ‘up’ (for same semaphore) happens in another thread (consumer) e.g.: In producer-consumer problem, producer wants to sleep … Read more

How to show all shared libraries used by executables in Linux?

Use ldd to list shared libraries for each executable. Cleanup the output Sort, compute counts, sort by count To find the answer for all executables in the “/bin” directory: find /bin -type f -perm /a+x -exec ldd {} \; \ | grep so \ | sed -e ‘/^[^\t]/ d’ \ | sed -e ‘s/\t//’ \ … Read more

Spring Boot application as a Service

The following works for springboot 1.3 and above: As init.d service The executable jar has the usual start, stop, restart, and status commands. It will also set up a PID file in the usual /var/run directory and logging in the usual /var/log directory by default. You just need to symlink your jar into /etc/init.d like … Read more

Keep SSH session alive [closed]

The ssh daemon (sshd), which runs server-side, closes the connection from the server-side if the client goes silent (i.e., does not send information). To prevent connection loss, instruct the ssh client to send a sign-of-life signal to the server once in a while. The configuration for this is in the file $HOME/.ssh/config, create the file … Read more

Print a file, skipping the first X lines, in Bash [duplicate]

You’ll need tail. Some examples: $ tail great-big-file.log < Last 10 lines of great-big-file.log > If you really need to SKIP a particular number of “first” lines, use $ tail -n +<N+1> <filename> < filename, excluding first N lines. > That is, if you want to skip N lines, you start printing line N+1. Example: … Read more

How can I use grep to show just filenames on Linux? [closed]

The standard option grep -l (that is a lowercase L) could do this. From the Unix standard: -l (The letter ell.) Write only the names of files containing selected lines to standard output. Pathnames are written once per file searched. If the standard input is searched, a pathname of (standard input) will be written, in … Read more

How to recursively find and list the latest modified files in a directory with subdirectories and times

Try this one: #!/bin/bash find $1 -type f -exec stat –format ‘%Y :%y %n’ “{}” \; | sort -nr | cut -d: -f2- | head Execute it with the path to the directory where it should start scanning recursively (it supports filenames with spaces). If there are lots of files it may take a while … Read more

How to replace a string in multiple files in linux command line

cd /path/to/your/folder sed -i ‘s/foo/bar/g’ * Occurrences of “foo” will be replaced with “bar”. On BSD systems like macOS, you need to provide a backup extension like -i ‘.bak’ or else “risk corruption or partial content” per the manpage. cd /path/to/your/folder sed -i ‘.bak’ ‘s/foo/bar/g’ *