Unix & Linux help chat. Unix & Linux Meta ... what is >> symbol and >& in unix/Linux? [duplicate] Ask ...

I used history | less to get the lines of previous commands and from the numbers on the left hand side I found the line I wanted repeated (eg. 22) and did !22 at the command prompt and it worked...

Dec 8, 2013 · What is the difference between the &&, ||, -a, and -o Unix operators? What are the restrictions on the usage of both types? Is it simply that the && and || operators should be used when using flags in the condition?

Apr 3, 2012 · * Note: Word splitting. The shell splits tokens based on the contents of the IFS environment variable. Its default value is \t\n; i.e., whitespace, tab, and newline.

Oct 24, 2012 · Since I don't understand what it does, I'm having trouble reducing it to a bare-bones example (and obfuscating any information that is company-secret). Also, I don't have the example command where it works available at the moment, it's just from memory. I'm actually trying to see if I can use the '@' symbol to perform a different task.

Nov 12, 2012 · The & symbol instructs commands to run in a background process and immediately returns to the command line for additional commands. sh my_script.sh & A background process will not stay alive after the shell session is closed.

Oct 12, 2009 · LF (\n) stands for LINE FEED. It creates a new line, but it doesn't put the cursor at the beginning of that line. The cursor stays back at the end of the last line. This is how Unix (including macOS) and Linux work. CRLF (\r\n) creates a new line as well as puts the cursor at the beginning of the new line. This is how we see it in Windows OS.

Jan 15, 2015 · I am using Ubuntu and when I list the libraries under /usr/lib/ I see that some of them have numbers and/or @ symbol at the end. For example libgc.so.1@ or libgettextlib.so@ Does anyone know what t...

Many of the Unix shells and the programming languages Perl, PHP, and Ruby use pairs of this character to indicate command substitution, that is, substitution of the standard output from one command into a line of text defining another command. For example, the code line: echo It is now `date` might result, after command substitution, in the ...

Mar 22, 2015 · When I do an ls in the /proc/PID directory a number of @ symbols show up next to the file names. Normally I would consider this to mean extended attributes but when I do the long form of ls they d...