sample loop by bash

for-in-array.txt

array=(
  array01
  array02
)

for entity in ${array[@]}; do
  echo "${entity}"
done

# 実行結果
array01
array02

for-in-cat-2.txt

# 000.txt
line 01
line 02
line 03

for line in `cat 001.txt`; do
  echo "${line}"
done

# 実行結果
line
01
line
02
line
03

for-in-cat.txt

# 000.txt
line01
line02
line03

for line in `cat 000.txt`; do
  echo "${line}"
done

# 実行結果
line01
line02
line03

for-in-ls-grep.txt

for textfile in $( ls . | grep .txt$ ); do
  echo "${textfile}"
done

# 実行結果
000.txt
001.txt

for-in-ls.txt

for textfile in $( ls . ); do
  echo "${textfile}"
done

# 実行結果
000.csv
000.txt
001.txt

for-in.txt

IP=128.0.0
  for i in 1 2 3; do
  echo "${IP}.$i"
done

# 実行結果
128.0.0.1
128.0.0.2
128.0.0.3