SG Bash Script Generator

SanchitGurukul Developer Tool

Bash Script Generator

Create a readable Bash script without executing anything on the WordPress server. Select building blocks, preview the result, copy it, or download it as a .sh file.

Safety: Generated scripts are templates. Review commands, paths, usernames, permissions, and package names before running them—especially with sudo or as root.

1. Script details

Script name Description Author Shell

2. Reliability and safety

Strict mode: set -Eeuo pipefail Safe IFS Error trap with line number Require root privileges Ask for confirmation Add dry-run option Log output to a file Prevent concurrent runs

3. Script building blocks

Primary example Custom command

4. Output options

Helpful comments Coloured status messages Timestamped messages Completion summary

Generated Bash script

Ready

How to upload and run the script

Download and review

Download the generated file. Open it in a text editor and verify every command and path.

Upload to Linux

scp system-check.sh user@server:/home/user/

Alternatively use SFTP, WinSCP, FileZilla, or your hosting file manager.

Connect to the server

ssh user@server

Set permissions

chmod 750 system-check.sh

750 allows the owner to run it and limits access for others.

Validate syntax

bash -n system-check.sh

No output usually means the Bash syntax is valid.

Run safely

./system-check.sh --help
./system-check.sh

Use sudo only when the script genuinely requires administrative permissions.

Debug when needed

bash -x system-check.sh

This prints commands as Bash processes them. Avoid it when secrets may appear in output.

Practical Bash examples

If statement

if [[ -f "/etc/os-release" ]]; then
  echo "Operating system information found"
else
  echo "File not found" >&2
fi

For loop

for host in server1 server2 server3; do
  printf 'Checking %s\n' "$host"
done

While loop

attempt=1
while (( attempt <= 3 )); do
  echo "Attempt: $attempt"
  ((attempt++))
done

Function with return handling

check_command() {
  local command_name="$1"
  command -v "$command_name" >/dev/null 2>&1
}

if check_command curl; then
  echo "curl is installed"
fi

Safe file-reading loop

while IFS= read -r line || [[ -n "$line" ]]; do
  printf '%s\n' "$line"
done < input.txt

Bash scripting best practices

Quote variable expansions: use "$variable".
Prefer [[ ... ]] for Bash conditions and (( ... )) for arithmetic.
Use mktemp for temporary files and remove them with a trap.
Validate arguments, files, commands, and permissions before making changes.
Do not place passwords, tokens, or private keys directly in scripts.
Test in a non-production environment and consider ShellCheck for static analysis.
Use absolute paths in cron jobs because cron has a limited environment.
Make destructive actions opt-in and support a dry-run mode where practical.

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