echo "test stdout >"
# echo 命令的輸出寫入到 output.txt 文件中，如果文件已經存在，會覆蓋原有內容。
echo hello world > output.txt
# 查看 output.txt 的內容
cat output.txt
echo 
# 再次使用 > 會覆蓋原內容
echo "test stdout >"
echo test test > output.txt
# 查看 output.txt 的內容
cat output.txt
echo 
# 將 echo 命令的輸出附加到 output.txt 文件的末尾
echo "test stdout >>"
echo hello world >> output.txt
# 查看 output.txt 的內容
cat output.txt
by

Online Bash Shell

Write, Run & Share Bash code online using OneCompiler's Online Bash Shell for free. It's one of the robust, feature-rich Bash shell available over online and getting started with the OneCompiler's Bash Shell is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Bash. OneCompiler also has reference scripts, where you can look for the sample scripts and start coding.

About Bash

Bash (Bourne Again Shell) is a shell program written by Brian Fox and is an upgraded version of Bourne Shell program 'sh'.

Features

  • Open source GNU project
  • Read and execute the commands from a Shell Script
  • Can be invoked by either single-character command line options (-a, -b, -c, -i, -l, -r, etc. ) or by multi-character command line options also like --help, --debugger,--login, etc.
  • Consists of Key bindings
  • Available in restricted mode for the environment security
  • Contains one-dimensional arrays to manipulate the lists of data.

Syntax help

Variables

name="Foo"
echo $name
echo "$name"
echo "${name}"

Conditional Statements

If

if [ conditional-expression ]  
then  
statements  
fi

If-else

if [ conditional-expression ]  
then  
   statements  
else  
  statements
fi

Else-If

if [ conditional-expression ]  
then  
   statements  
elif [ conditional-expression ]  
then  
 statements  
else  
  statements
fi