hans/pure-bash-bible
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Added loops

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Dylan Araps
2018-06-15 16:35:22 +10:00
parent 1c19fab15c
commit 8bd977f5d3
1 changed files with 12 additions and 0 deletions
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README.md
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@@ -62,7 +62,9 @@ scripts and not full blown utilities.
* [Toggle between two values.](#toggle-between-two-values) * [Toggle between two values.](#toggle-between-two-values)
* [Loops](#loops) * [Loops](#loops)
* [Loop over a range of numbers.](#loop-over-a-range-of-numbers) * [Loop over a range of numbers.](#loop-over-a-range-of-numbers)
* [Loop over a variable range of numbers.](#loop-over-a-variable-range-of-numbers)
* [Loop over an array.](#loop-over-an-array) * [Loop over an array.](#loop-over-an-array)
* [Loop over an array with an index.](#loop-over-an-array-with-an-index)
* [Loop over files and directories.](#loop-over-files-and-directories) * [Loop over files and directories.](#loop-over-files-and-directories)
* [File handling](#file-handling) * [File handling](#file-handling)
* [Read a file to a string.](#read-a-file-to-a-string) * [Read a file to a string.](#read-a-file-to-a-string)
@@ -565,7 +567,13 @@ Don't use `seq`.
for i in {0..100}; do for i in {0..100}; do
printf '%s\n' "$i" printf '%s\n' "$i"
done done
```
## Loop over a variable range of numbers.
Don't use `seq`.
```shell
# Loop from 0-VAR. # Loop from 0-VAR.
VAR=50 VAR=50
for ((i=0;i<=VAR;i++)); do for ((i=0;i<=VAR;i++)); do
@@ -582,7 +590,11 @@ arr=(apples oranges tomatoes)
for element in "${arr[@]}"; do for element in "${arr[@]}"; do
printf '%s\n' "$element" printf '%s\n' "$element"
done done
```
## Loop over an array with an index.
```shell
# Elements and index. # Elements and index.
for i in "${!arr[@]}"; do for i in "${!arr[@]}"; do
printf '%s\n' "${arr[$i]}" printf '%s\n' "${arr[$i]}"