Insert text in specific lines of a file
How can I insert some text in specific lines of a file? What is the simplest method that I can use? (bash, sed, awk?)
bash
Multiple commands during an SSH inside an SSH session
I have a local machine which is supposed to make an SSH session to a remote master machine and then another inner SSH session from the master to each of some remote slaves, and then execute 2 commands i.e. to delete a specific directory and recreate it.
Non-interactive shell expand alias
I’m having trouble getting aliases to expand on my hosting account when I run a command like:
JSON array to bash variables using jq
I’ve got a JSON array like so:
Why isn’t [ -n ] false like [ -n “” ]?
My question is on return values produced by this code:
How do you recall the last (n-th?) passed argument of the previous command you used with bash?
Often times I issue different commands on the same file. For example:
is there a way to set coloring for cd tab complete?
I use ubuntu 11.04.
Have xargs use alias instead of binary
Bash 4.2 on CentOS 6.5:
In a bash shell script, writing a for loop that iterates over string values
In bash, I know that it is possible to write a for loop in which some loop control variable i iterates over specified integers. For example, I can write a bash shell script that prints the integers between 1 and 10:
How should I add users non-interactively?
I have a set of users I need to add to a new system as part of a BASH script that preps my server. How can I non-interactively add the user, create their home directory, set the group, and enter a default password?