Sep 14, 2012 · In Bash, there appear to be several variables which hold special, consistently-meaning values. For instance, ./myprogram &; echo $! will return the PID of the process which backgrounded myprog...

It depends on the Test Construct around the operator. Your options are double parentheses, double brackets, single brackets, or test. If you use ((…)), you are testing arithmetic equality with == as in C: $ (( 1==1 )); echo $? 0 $ (( 1==2 )); echo $? 1 (Note: 0 means true in the Unix sense and a failed test results in a non-zero number.) Using -eq inside of double parentheses is …

Sep 10, 2011 · When you try to execute a program in unix (one with the executable bit set), the operating system will look at the first few bytes of the file. These form the so-called "magic number", which can be used to decide the format of the program and how to execute it. #! corresponds to the magic number 0x2321 (look it up in an ascii table).

Sep 16, 2024 · UNIX®, an open standard owned and managed by The Open Group, is an enabler of key technologies and delivers reduced total cost of ownership, increased IT agility, stability, and interoperability in hetero¬geneous environments enabling business and …

Nov 11, 2014 · What is the difference between -f and -s Option in If condition Mainly how they are different in functionality? I know the google meaning of these but want to know the practical use.

May 5, 2011 · How can I recursively find all files in current and subfolders based on wildcard matching?

Mar 9, 2018 · A: To "execute this script" from the terminal on a Unix/Linux type system, you have to do three things: 1. Tell the system the location of the script. (pick one) # type the name of the script with the full path > /path/to/script.sh # execute the script from the directory it is in > ./script.sh # place the script in a directory that is on the PATH > script.sh # ... to see the list of ...

Nov 9, 2012 · I have two directories with the same list of files. I need to compare all the files present in both the directories using the diff command. Is there a simple command line option to do it, or do I h...

Jul 22, 2010 · I am using the below code for replacing a string inside a shell script. echo $LINE | sed -e 's/12345678/"$replace"/g' but it's getting replaced with $replace instead ...

Apr 3, 2012 · What does a dollar sign followed by an at-sign (@) mean in a shell script? For example: umbrella_corp_options $@