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Although Picasa is now available on GNU/Linux, it is still proprietary and, as such, unethical. One year ago, I wrote a simple Bash script that handles a very rapid download of entire PicasaWeb albums/galleries. During the last weeks, Google changed twice the format of the related Web pages and my script could not fetch any picture.
How to use a Bash Shell script to record the activity of users. This
script is useful in rebuilding the actions of users as they work at
the command line.
Reading files is no big deal with bash: you just redirect the input to the script or pipe the output of another command into the script, or you could do it inside the script if the file names are pre-determined. You could also use process substitution to pass in the open files (command pipelines actually) from the command line.
The Bash Debugger Project (bashdb) lets you set breakpoints, inspect variables, perform a backtrace, and step through a bash script line by line. In other words, it provides the features you expect in a C/C++ debugger to anyone programming a bash script.