fun with bash scripts

escaping - Command to escape a string in bash - Stack Overflow

http://stackoverflow.com/questions/2854655/command-to-escape-a-string-in-bash

div[style='display: none;']

ul>li*>a[href=$#]{$#}; li*>a[href=$#]{$#}

• http://stackoverflow.com/questions/2854655/command-to-escape-a-string-in-bash
• http://stackoverflow.com/questions/6306386/how-can-i-escape-an-arbitrary-string-for-use-as-a-command-line-argument-in-bash
• http://stackoverflow.com/questions/8467424/echo-new-line-in-bash-prints-literal-n

Especially when printing or creating strings using user arguments to a bash script, special characters or even spaces may be introduced. We don't want a string argument to be split up into several arguments, so those values need to be escaped.

$ printf "%q" "hello\world"
hello\\world

linux - eval command in Bash and its typical uses - Stack Overflow

http://stackoverflow.com/questions/11065077/eval-command-in-bash-and-its-typical-uses

There is a way of saying 'the value of the variable whose name is in this variable'

echo ${!n}
one

Always put double quotes around variable and command substitutions, unless you know you need to leave them off. - Gilles

http://stackoverflow.com/questions/11065077/eval-command-in-bash-and-its-typical-uses

newline - Echo new line in bash prints literal \n - Stack Overflow

http://stackoverflow.com/questions/8467424/echo-new-line-in-bash-prints-literal-n

When desiring to display the name of the script file being run, even when the extra '.' is included out front...

$ ./s
$0 is: ./s
$BASH_SOURCE is: ./s
$ . ./s
$0 is: bash
$BASH_SOURCE is: ./s

Why should eval be avoided in bash, and what should I use instead? - Stack Overflow

http://stackoverflow.com/questions/17529220/why-should-eval-be-avoided-in-bash-and-what-should-i-use-instead

Using eval does smell dangerous. This might be a good read.

2.4 How to Add Files to Existing Archives

http://www.apl.jhu.edu/Misc/Unix-info/tar/tar_28.html

Came across the need to add a file to a tar archive. Doesn't seem to be in the quick help; perhaps the man pages do.

tar --append --file=afiles.tar arbalest

linux - Any way to exit bash script, but not quitting the terminal - Stack Overflow

http://stackoverflow.com/questions/9640660/any-way-to-exit-bash-script-but-not-quitting-the-terminal

I was using exit to stop all processing and not continue. It worked alright, but it would always kill my terminal session.

Instead of using exit, you will want to use return.

Dominik Honnef, http://stackoverflow.com/questions/9640660/any-way-to-exit-bash-script-but-not-quitting-the-terminal