How do I join two strings under BASH? I have two strings stored in two different variables (_p=/delta and _u=aqua) and how do I join this and assign it to another variable in bash?
You can use parameter substitution as follows:
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_p="/delta"
_u="aqua"
### join two $vars ###
out="${_p}${_u}"
echo "${_p}${_u}"
echo "${_p} and ${_u}"
echo "${_p}/${_u}"
echo "Output: $out" |
_p="/delta"
_u="aqua"
### join two $vars ###
out="${_p}${_u}"
echo "${_p}${_u}"
echo "${_p} and ${_u}"
echo "${_p}/${_u}"
echo "Output: $out"
Another example:
#!/bin/bash
_domain="${1:-example.com}"
_root="/chroot"
_path="${_root}/${_domain}"
echo "Host: ${HOSTNAME}@$(date) by $USER"
echo
echo "Setting Apache for ${_domain} @ ${_path}...."
# setupJail "${_domain}" "${_path}" |
#!/bin/bash
_domain="${1:-example.com}"
_root="/chroot"
_path="${_root}/${_domain}"
echo "Host: ${HOSTNAME}@$(date) by $USER"
echo
echo "Setting Apache for ${_domain} @ ${_path}...."
# setupJail "${_domain}" "${_path}"
Sample outouts:
./setup.httpd nixcraft.net.in
Host: www34.nixcraft.com@Fri Nov 19 01:44:03 IST 2010 by root
Setting Apache for nixcraft.net.in @ /chroot/nixcraft.net.in...
Posted by: Vivek Gite
The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.
2 comment
Assigned the variables in a quoted string, you can include or not include spaces, commas or anything else as you like.
a=”part one”
b=”part two”
c=”$a, $b”
echo “$c”
part one, part two
http://tldp.org/LDP/abs/html/bashver3.html – for more info check it out
The += operator is now permitted in in places where previously only the = assignment operator was recognized.
a=1
echo $a # 1
a+=5 # Won’t work under versions of Bash earlier than 3.1.
echo $a # 15
a+=Hello
echo $a # 15Hello