expansion

I have a set of files with a given suffix. For instance, I have a set of pdf files with suffix .pdf . I would like to obtain the names of the files without the suffix using substring expansion. For a single file I can use: file="test.pdf" echo ${file:0 -4} To do this operation for all files, I now tried: files=( $(ls *.pdf) ) ff=( "${files[@]:0: -4}" ) echo ${ff[@]} I now get an error saying that substring expression < 0 .. ( I would like to avoid using a for loop ) Use parameter expansions to remove the .pdf part like so: shopt -s nullglob files=( *.pdf ) echo "${files[@]%.pdf}" The shopt -s

I have a problem with a bash script. I have to use the operator * to multiplicate. Instead the script bugs me with expansion and using as operator the name of the script itself. I tried with single quotes but it doesn't work :( Here's the code #!/bin/bash -x # Bash script that calculates an arithmetic expression # NO PRECEDENCE FOR OPERATORS # Operators: + - * if [ "$#" -lt "3" ] then echo "Usage: ./calcola.scr <num> <op> <num> ..." exit 1 fi result=0 op=+ j=0 for i in "$@" do if [ "$j" -eq "0" ] then # first try #result=$(( $result $op $i )) # second try let "result$op=$i" j=1 else op=$i j=0

This question already has answers here : Accessing bash command line args $@ vs $* (5 answers) Closed 3 years ago . Is there any difference between $@ and "$@" ? I understand there may be differences for non special characters, but what about the @ sign with input arguments? fedorqui Yes! $ cat a.sh echo "$@" echo $@ Let's run it: $ ./a.sh 2 "3 4" 5 2 3 4 5 # output for "$@" 2 3 4 5 # output for $@ -> spaces are lost! As you can see, using $@ makes the parameters to "lose" some content when used as a parameter. See -for example- I just assigned a variable, but echo $variable shows something

Is it possible to expand all components when page is load or when an event occurs? Thanks!! Simply use this $('#accordion .ui-accordion-content').show(); No, if you are referring to accordion as your tag states. From jQuery. NOTE: If you want multiple sections open at once, don't use an accordion http://docs.jquery.com/UI/API/1.8/Accordion I would recommend this plugin Multi-open Accordion // this will make the second tab by default opened (index starts from 0) $('#multiAccordion').multiAccordion({active: 1 }); // [ OR ] // supports multiple tabs to be opened by default $('#multiAccordion')

Is there an efficient (fast) algorithm that will perform bit expansion/duplication? For example, expand each bit in an 8bit value by 3 (creating a 24bit value): 1101 0101 => 11111100 01110001 11000111 The brute force method that has been proposed is to create a lookup table. In the future, the expansion value may need to be variable. That is, in the above example we are expanding by 3 but may need to expand by some other value(s). This would require multiple lookup tables that I'd like to avoid if possible. There is a chance to make it quicker than lookup table if arithmetic calculations are