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How can I check if a program exists from a Bash script?

...iar with 'advanced' i/o redirection in bash: 1) 2>&- ("close output file descriptor 2", which is stderr) has the same result as 2> /dev/null; 2) >&2 is a shortcut for 1>&2, which you may recognize as "redirect stdout to stderr". See the Advanced Bash Scripting Guide i/o redi...
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Copy entire contents of a directory to another using php

... It seems that copy only handle single files. Here is a function for copying recursively I found in this note on the copy documentation page: <?php function recurse_copy($src,$dst) { $dir = opendir($src); @mkdir($dst); while(false !== ( $file =...
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Git SSH error: “Connect to host: Bad file number”

... 22: Connection timed out ssh: connect to host github.com port 22: Bad file number You will only see the bad file number message when on windows using the MINGGW shell. Linux users will just get Timed out. Problem: SSH is probably blocked on port 22. You can see this by typing $nmap -sS...
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How to copy Docker images from one host to another without using a repository

... You will need to save the Docker image as a tar file: docker save -o <path for generated tar file> <image name> Then copy your image to a new system with regular file transfer tools such as cp, scp or rsync(preferred for big files). After that you will have ...
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Get current folder path

I want to create a program that converts files. I would like the user to be able to place the executable file in any directory, and when executing that program (double-clicking on the .exe) I want the program to process all the files within the current folder where the exe file exists . How can the...
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Gradle, “sourceCompatibility” vs “targetCompatibility”?

...s is how I sort this issue out, right in the beginning of the build.gradle file. – Xerus Nov 6 '17 at 10:28 2 ...
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psql: could not connect to server: No such file or directory (Mac OS X)

...e postmaster has exited.). SOLUTION: This fixed the issue--I deleted this file, and then everything worked! /usr/local/var/postgres/postmaster.pid -- and here is how I figured out why this needed to be deleted. I used the following command to see if there were any PG processes running. for m...
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Node.js check if path is file or directory

... Objects returned from fs.stat() and fs.lstat() are of this type. stats.isFile() stats.isDirectory() stats.isBlockDevice() stats.isCharacterDevice() stats.isSymbolicLink() (only valid with fs.lstat()) stats.isFIFO() stats.isSocket() NOTE: The above solution will throw an Error if; for ex, the fil...
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lsof survival guide [closed]

... increadibly powerful command-line utility for unix systems. It lists open files, displaying information about them. And since most everything is a file on unix systems, lsof can give sysadmins a ton of useful diagnostic data. ...
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JQuery to load Javascript file dynamically

I have a very large javascript file I would like to load only if the user clicks on a certain button. I am using jQuery as my framework. Is there a built-in method or plugin that will help me do this? ...