Tags
#php
#kotlin
#bash
#go
#sql
#rust
#typescript
#html
#java
#python
#files
#utils
#strings
#http
#concurrency
#async
#json
#arrays
#security
#types
#crypto
#database
#dates
#format
Bash
Find Largest Files and Directories
Quick "where did all my disk go?" answer. du sorts by size, ncdu (interactive) is better for exploration.
@admin
Bash
Memory / CPU / Load Quick Check
One-liners for the three most-requested system metrics. Use in monitoring scripts or as ad-hoc sanity checks.
Bash
Generate a Random Password
Three approaches: pwgen (purpose-built), openssl (universally available), /dev/urandom + tr (zero deps). Pick by what's installed.
Bash
Check Systemd Service Is Running
`systemctl is-active` is the right tool — exit code 0 if running, non-zero otherwise. Combine with restart-on-fail for poor-man's supervision.
Bash
Tar Archive with Timestamp
Pack up a directory with a date-stamped filename for easy backups. -z for gzip, -j for bzip2, -J for xz (smallest, slowest).
Bash
Disk Space Alert
Cron-friendly script that checks disk usage on each filesystem and emails (or webhooks) if any partition exceeds a threshold.
Bash
Cron Entry From Script
Append a cron job idempotently — grep first to avoid duplicates on re-run. Doesn't require editing files manually.
Bash
OS / Distro Detection
Read /etc/os-release for distro info — it's the standard on every modern Linux. Branch deploy scripts on distro to pick apt vs. dnf vs. apk.
Bash
Detect Whether Running as Root
Several scripts must run as root (or refuse to). EUID is more reliable than `whoami == root` because sudo without -E may change one but not the other.
Bash
Rotate Logs Manually
If a service doesn't hook into logrotate, you can still rotate a log file yourself in one safe pattern: rename current → .1, truncate the original, signal the process to re-open if needed.