echo -e $lines | while read line … done The while loop is executed in a subshell. So any changes you do to the variable will not be available once the subshell exits. Instead you can use a here string to re-write the while loop to be in the main shell process; only echo -e … Read more
If you really want to use single quotes in the outermost layer, remember that you can glue both kinds of quotation. Example: alias rxvt=”urxvt -fg “”‘”‘#111111′”‘”‘ -bg ‘”‘”‘#111111′”‘” # ^^^^^ ^^^^^ ^^^^^ ^^^^ # 12345 12345 12345 1234 Explanation of how ‘”‘”‘ is interpreted as just ‘: ‘ End first quotation which uses single quotes. … Read more
for i in $(seq 1 $END); do echo $i; done edit: I prefer seq over the other methods because I can actually remember it 😉
By convention, environment variables (PAGER, EDITOR, …) and internal shell variables (SHELL, BASH_VERSION, …) are capitalized. All other variable names should be lower case. Remember that variable names are case-sensitive; this convention avoids accidentally overriding environmental and internal variables. Keeping to this convention, you can rest assured that you don’t need to know every environment … Read more
I’ve been looking for better way of doing it recently. Associative array sounded like overkill for me. Look what I found: suffix=bzz declare prefix_$suffix=mystr …and then… varname=prefix_$suffix echo ${!varname}
How do I split a string on a delimiter in Bash?
How do I parse command line arguments in Bash?
Why When the string is expanded, it is split into words, but it is not re-evaluated to find special characters such as quotes or dollar signs or … This is the way the shell has ‘always’ behaved, since the Bourne shell back in 1978 or thereabouts. Fix In bash, use an array to hold the … Read more
How can I get the source directory of a Bash script from within the script itself?
You cannot have spaces around the = sign. When you write: STR = “foo” bash tries to run a command named STR with 2 arguments (the strings = and foo) When you write: STR =foo bash tries to run a command named STR with 1 argument (the string =foo) When you write: STR= foo bash … Read more