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Merge branch 'master' of github.com:dylanaraps/pure-sh-bible

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Dylan Araps 2019-09-24 07:58:15 +03:00
parent 32e27e1f84 460ccfdfd7
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README.md
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@ -211,12 +211,12 @@ John Black is my name.
```shell ```shell
case $var in case $var in
*sub_string*) *sub_string1*)
# Do stuff # Do stuff
;; ;;
*sub_string2*) *sub_string2*)
# Do more stuff # Do other stuff
;; ;;
*) *)
@ -231,12 +231,12 @@ esac
```shell ```shell
case $var in case $var in
sub_string*) sub_string1*)
# Do stuff # Do stuff
;; ;;
sub_string2*) sub_string2*)
# Do more stuff # Do other stuff
;; ;;
*) *)
@ -251,12 +251,12 @@ esac
```shell ```shell
case $var in case $var in
*sub_string) *sub_string1)
# Do stuff # Do stuff
;; ;;
*sub_string2) *sub_string2)
# Do more stuff # Do other stuff
;; ;;
*) *)
@ -411,10 +411,12 @@ Alternative to the `head` command.
head() { head() {
# Usage: head "n" "file" # Usage: head "n" "file"
while read -r line; do while read -r line; do
[ "$i" = "$1" ] && break
printf '%s\n' "$line" printf '%s\n' "$line"
i=$((i+1)) i=$((i+1))
[ "$i" = "$1" ] && return
done < "$2" done < "$2"
[ -n "$line" ] && printf %s "$line"
} }
``` ```
@ -438,7 +440,7 @@ Alternative to `wc -l`.
```sh ```sh
lines() { lines() {
# Usage: lines "file" # Usage: lines "file"
while read -r _; do while read -r line || [ -n "$line" ]; do
lines=$((lines+1)) lines=$((lines+1))
done < "$1" done < "$1"
@ -457,6 +459,8 @@ $ lines ~/.bashrc
This works by passing the output of the glob to the function and then counting the number of arguments. This works by passing the output of the glob to the function and then counting the number of arguments.
**CAVEAT:** When the glob does not match anything (empty directory or no matching files) it is not expanded and the function returns `1`.
**Example Function:** **Example Function:**
```sh ```sh
@ -584,7 +588,7 @@ done
## Loop over the contents of a file ## Loop over the contents of a file
```shell ```shell
while read -r line; do while read -r line || [ -n "$line" ]; do
printf '%s\n' "$line" printf '%s\n' "$line"
done < "file" done < "file"
``` ```
@ -593,19 +597,24 @@ done < "file"
Don’t use `ls`. Don’t use `ls`.
**CAVEAT:** When the glob does not match anything (empty directory or no matching files) the variable will contain the unexpanded glob. To avoid working on unexpanded globs check the existence of the file contained in the variable using the appropriate [file conditional](#file-conditionals). Be aware that symbolic links are resolved.
```shell ```shell
# Greedy example. # Greedy example.
for file in *; do for file in *; do
[ -e "$file" ] || [ -L "$file" ] || continue
printf '%s\n' "$file" printf '%s\n' "$file"
done done
# PNG files in dir. # PNG files in dir.
for file in ~/Pictures/*.png; do for file in ~/Pictures/*.png; do
[ -f "$file" ] || continue
printf '%s\n' "$file" printf '%s\n' "$file"
done done
# Iterate over directories. # Iterate over directories.
for dir in ~/Downloads/*/; do for dir in ~/Downloads/*/; do
[ -d "$dir" ] || continue
printf '%s\n' "$dir" printf '%s\n' "$dir"
done done
``` ```