bash4

Been looking for some more advanced regex info on regex with bash and have not found much information on it. Here's the concept, with a simple string: myString="DO-BATCH BATCH-DO" if [[ $myString =~ ([[:alpha:]]*)-([[:alpha:]]*) ]]; then echo ${BASH_REMATCH[1]} #first perens echo ${BASH_REMATCH[2]} #second perens echo ${BASH_REMATCH[0]} #full match fi outputs: BATCH DO DO-BATCH So fine it does the first match (BATCH-DO) but how do I pull a second match (DO-BATCH)? I'm just drawing a blank here and can not find much info on bash regex. OK so one way I did this is to put it in a for loop:

I put the following unsuccessfully to my .bashrc shopt -s globstar I am trying to test the command in action by ls **/*.c and by comparing it to ls */*/*.c How can you enable globstar in Bash 4? Hmm. shopt -s globstar should work. To debug, make sure you are running Bash 4: $SHELL --version Then check the setting of globstar : shopt globstar If it is unset, try setting it manually: shopt -s globstar Now see if that works. If it does, you might want to look into why your .bashrc isn't working. Did you remember to restart you shell after editing your .bashrc , or load it with . .bashrc ? 来源：

Based on an associative array in a Bash script, I need to iterate over it to get the key and value. #!/bin/bash declare -A array array[foo]=bar array[bar]=foo I actually don't understand how to get the key while using a for-in loop. The keys are accessed using an exclamation point: ${!array[@]} , the values are accessed using ${array[@]} . You can iterate over the key/value pairs like this: for i in "${!array[@]}" do echo "key : $i" echo "value: ${array[$i]}" done Note the use of quotes around the variable in the for statement (plus the use of @ instead of * ). This is necessary in case any