Linux Basics

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Where is my program?

To find where is your program located, you can use which command.

For example,

which java

would print /usr/bin/java which means java is a command in the directory /usr/bin.

To further find out, you can use:

ls -l /usr/bin/java

This would display:

lrwxrwxrwx 1 root root 22 May 18  2016 /usr/bin/java -> /etc/alternatives/java

It mean that /usr/bin/java is actually a link to /etc/alternatives/java

Let us try:

ls -l /etc/alternatives/java

It should display something like:

lrwxrwxrwx 1 root root 72 May 18  2016 /etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-

Further, to find out about the content of a file, you can use file command:

file /usr/lib/jvm/java-1.8.0-openjdk-

This should display something like

/usr/lib/jvm/java-1.8.0-openjdk- ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.32, BuildID[sha1]=df3fba6cc0f63b51a2270014a3994480680a8ca0, stripped

This means it is a Linux binary.

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