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| # We want to process all of the *.zip files in the current directory. | # Bash # Process all of the *.zip files in the current directory. |
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| * An array named {{{files}}} is populated with all the files we want to process. * {{{dialog}}} is invoked, and its input is redirected from a process substitution. (A pipe could also be used here; we'd simply have to reverse the {{{dialog}}} command and the loop.) |
* An [:BashFAQ/005:array] named {{{files}}} is populated with all the files we want to process. * {{{dialog}}} is invoked, and its input is redirected from a ProcessSubstitution. (A pipe could also be used here; we'd simply have to reverse the {{{dialog}}} command and the loop.) |
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| For more examples of using {{{dialog}}}, see [#faq40 FAQ #40]. | For more examples of using {{{dialog}}}, see [:BashFAQ/040:FAQ #40]. |
How do I create a progress bar?
The easiest way is to use dialog --gauge. Here is an example, which relies heavily on BASH features:
# Bash
# Process all of the *.zip files in the current directory.
files=(*.zip)
dialog --gauge "Working..." 20 75 < <(
n=${#files[*]}; i=0
for f in "${files[@]}"; do
# process "$f" in some way (for testing, "sleep 1")
echo $((100*(++i)/n))
done)Here's an explanation of what it's doing:
An [:BashFAQ/005:array] named files is populated with all the files we want to process.
dialog is invoked, and its input is redirected from a ProcessSubstitution. (A pipe could also be used here; we'd simply have to reverse the dialog command and the loop.)
- The processing loop iterates over the array.
Every time a file is processed, it increments a counter (i), and writes the percent complete to stdout.
For more examples of using dialog, see [:BashFAQ/040:FAQ #40].