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count returns 0 when no file/directory exists.

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melangston 2020-02-15 08:57:44 -05:00 committed by GitHub
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README.md
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@ -475,37 +475,30 @@ $ lines ~/.bashrc
## Count files or directories in directory
This iterates over every item in the glob argument/* and tallies them if they exist.
Using pathname expansion to generate a list of filesystem entries that match a pattern and count them.
**Example Function:**
```sh
count() {
# Usage: count /Example/Dir
# Returns either number of files/directories found under /Example/Dir
# or '-1' if /Example/Dir is not a directory.
# Test if /Example/Dir actually exists and is a directory.
# Return -1 if not an existing directory.
[ -d "$1" ] || { printf '%d\n' -1 ; exit ; }
# Usage: count [.]/Example/Dir/* Count all files.
# count [.]/Example/Dir/*/ Count all subdirectories of /Example/Dir
# count [.]/Example/Dir/*.jpg Count all files ending in .jpg
# count [.]/Example/Dir/*/*.jpg Count all subdirectories containing files ending in .jpg
i=0
# "${1%/}/" Handles both /Example/Dir and /Example/Dir/
# Generates all items in expansion of /Example/Dir/* and
# iterates over them in for loop.
for f in "${1%/}/"*
# For each expansion of /Example/Dir/*, count if it exists in the file system.
for f in "$@"
do
# Because "${1%/}/"* is expanded to literal '/Example/Dir/*' when
# no match for * is found, we have to test for its existence
# before tallying it.
# Because "$@" is expanded to literal '/Example/Dir/*' when
# no match for * is found, we have to test for the expansions existence
# before counting it. This will appropriately count a file named '*' in /Example/Dir.
#
# By changing -e to -{f,d,...} you
# can count only {files,directories,...} or combine
# By changing -e to -{f,d,...,} the function
# can count only {files,directories,...,} or combine
# tests with '||' to count combinations.
[ ! -e "$f" ] && continue
i=$(( i + 1 ))
@ -513,16 +506,20 @@ count() {
printf '%d\n' $i
}
```
**Example Usage:**
```shell
# Count all files and items in dir.
$ count ~/Downloads/
# Count any filesystem entry in ~/Downloads.
$ count ~/Downloads/*
232
# Count subdirectories of ~/Documents.
$ count ~/Documents/*/
4
```
## Create an empty file