realpath command not found
I have debian squeeze amd64. My current shell is bash. If I write the following in my terminal, it works:
bash
cp vs. cat to copy a file
cp a b and cat a > b, what’s the difference?
How do you time how long a command took to run?
How would you find out how long a running process took to complete? Example: date; dd bs=1m if=/foo of=bar; date ^This example only has 1 second of resolution. Any shell is acceptable. Answers: Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue … Read more
Does a shortcut for executing a series of commands in bash history exist?
Suppose I have the following trivial example in my history:
Escaping both forward slash and back slash with sed
I have the following string: /tmp/test/folder1/test.txt
How to trigger error using Trap command
I am using Ubuntu 12.04.2. I am trying to use “trap” command to capture abnormal or error in my shell script but I am also trying to manually trigger “Error” exit.
When is /etc/bash.bashrc invoked?
What is this file anyway? Documentation makes no mention of it. And it’s not supposed to be run automatically (version 4.3, 2 February 2014):
Testing if a file descriptor is valid
I’d like to make a bash script output additional information to file descriptors (FDs) greater than or equal to 3, when they are open. To test whether an FD is open, I devised the following trick:
Verify the length of a variable
I’ve to verify the length of variable read (my script limit to five the characters inserted), I think about something like this: