If you really need to use an alias with a parameter for some reason, you can hack it by embedding a function in your alias and immediately executing it: alias example=”f() { echo Your arg was $1. };f” I see this approach used a lot in .gitconfig aliases.
Ansible uses YAML syntax in its playbooks. YAML has a number of block operators: The > is a folding block operator. That is, it joins multiple lines together by spaces. The following syntax: key: > This text has multiple lines Would assign the value This text has multiple lines\n to key. The | character is … Read more
Here’s yet another solution. This uses POSIX substring parameter expansion, so it works in Bash, Dash, KornShell (ksh), Z shell (zsh), etc. test “${string#*$word}” != “$string” && echo “$word found in $string” A functionalized version with some examples: # contains(string, substring) # # Returns 0 if the specified string contains the specified substring, # otherwise … Read more
Not messing with IFS Not calling external command variable=abc,def,ghij for i in ${variable//,/ } do # call your procedure/other scripts here below echo “$i” done Using bash string manipulation http://www.tldp.org/LDP/abs/html/string-manipulation.html
You can write a script that only return the IP like: /sbin/ifconfig eth0 | grep ‘inet addr’ | cut -d: -f2 | awk ‘{print $1}’ For MAC: ifconfig | grep “inet ” | grep -v 127.0.0.1 | cut -d\ -f2 Or for linux system hostname -i | awk ‘{print $3}’ # Ubuntu hostname -i # … Read more
It’s called a shebang, and tells the parent shell which interpreter should be used to execute the script. #!/bin/sh <——— bourne shell compatible script #!/usr/bin/perl <– perl script #!/usr/bin/php <— php script #!/bin/false <—— do-nothing script, because false returns immediately anyways. Most scripting languages tend to interpret a line starting with # as comment and … Read more
The general idea is that make supports (reasonably) minimal rebuilds — i.e., you tell it what parts of your program depend on what other parts. When you update some part of the program, it only rebuilds the parts that depend on that. While you could do this with a shell script, it would be a … Read more
Check “The folder metaphor” section at Wikipedia. It states: There is a difference between a directory, which is a file system concept, and the graphical user interface metaphor that is used to represent it (a folder). For example, Microsoft Windows uses the concept of special folders to help present the contents of the computer to … Read more
There’s a lot of answers already, but they all seem overly complicated or solve problems the asker didn’t have. simply: # save the config to a file vagrant ssh-config > vagrant-ssh # run ssh with the file. ssh -F vagrant-ssh default
A Bash function can’t return a string directly like you want it to. You can do three things: Echo a string Return an exit status, which is a number, not a string Share a variable This is also true for some other shells. Here’s how to do each of those options: 1. Echo strings lockdir=”somedir” … Read more