For Loops

Simple for loop with list

#!/bin/bash
for i in 1 2 3 4 5; do
    echo "Number: $i"
done

For loop with numeric range

#!/bin/bash
for i in {1..10}; do
    echo "Number: $i"
done

For loop with step size

#!/bin/bash
for i in {1..10..2}; do
    echo "Odd number: $i"
done

Iterate over files matching pattern

#!/bin/bash
for file in *.txt; do
    echo "Processing file: $file"
done

Iterate over array elements

#!/bin/bash
fruits=("apple" "banana" "cherry")
for fruit in "${fruits[@]}"; do
    echo "Fruit: $fruit"
done

For loop using C-style syntax with arithmetic evaluation

#!/bin/bash
for (( i=1; i<=10; i++ )); do
    echo "Number: $i"
done

For loop with custom step size

#!/bin/bash
for (( i=0; i<=20; i+=2 )); do
    echo "Even number: $i"
done

For loop with multiple variables

#!/bin/bash
for (( i=1, j=10; i<=5; i++, j-- )); do
    echo "i=$i, j=$j"
done

For loop iterating over command output

#!/bin/bash
for file in $(ls *.txt); do
    echo "Processing: $file"
    wc -l "$file"
done

For loop with multiple file extensions using glob patterns

#!/bin/bash
for file in /path/to/files/*.{txt,log,csv}; do
    if [ -f "$file" ]; then
        echo "Found file: $file"
    fi
done

For loop processing all command line arguments

#!/bin/bash
for arg in "$@"; do
    echo "Argument: $arg"
done

Bash for loop with process substitution

#!/bin/bash
for file in <(ls *.txt); do
    echo "Processing: $file"
done

Bash for loop with IFS (Internal Field Separator) manipulation

#!/bin/bash
IFS=$'\n'
for line in $(cat file.txt); do
    echo "Line: $line"
done
unset IFS