Value & Environment Validator

提供整数/浮点数、范围、比较、IPv4、文件新旧、变量未设置及 TTY/WSL/Termux 等终端环境检测；批量检查以退出码 0/1 表示结果，适合脚本预检与条件分支。

lunrenyi

热度 36.47

最近更新 2026-05-11 17:37:23

分类：开发依赖：代码执行 / 读写文件应用场景：自动化脚本 / 工作流 / DevOps

安装技能

复制下面的话术发给你的 Agent，它会通过 secure-skills 检索并安装该技能。

执行命令安装此 skill： npx secure-skills-cli add x-is

Metadata

name: x-is
description: Value validation and environment detection tool for Shell scripts. Validates input types (integers, floats, IPs), compares file ages, detects runtime environments (TTY, WSL, Termux, Cygwin). Supports batch checking with exit code 0 success / 1 failure. Trigger when user needs to validate input types, detect terminal environment, check file freshness, verify variable states, or perform environment suitability checks (suitable_pkg/suitable_advise). Keywords: validate, check, verify, is, integer, float, positive, negative, range, IP address, file age, interactive, WSL, Termux, environment detection, unset variable, batch check.
license: MIT
compatibility: POSIX Shell (sh/bash/zsh/dash/ash)
metadata: {"author":"X-CMD","version":"1.0.0","category":"core","tags":["shell","cli","tools","validation","type-check","environment-detection"],"repository":"https://github.com/x-cmd/skill","display_name":"Value & Environment Validator"}

x is - Value & Environment Validation

x is is x-cmd's value validation tool for checking if values or environment states meet specific criteria. Supports batch checking multiple values, ideal for robust Shell scripting.

Prerequisites

Load x-cmd before use:
```
. ~/.x-cmd.root/X
```

Core Usage

Type Check: x is int 42 100 -5 / x is float 3.14
Range Check: x is minmax 1 100 50 75
Compare: x is eq "a" "a" / x is within "ok" pending success
IP Check: x is ip 192.168.1.1
File Age: x is newest target src/*.c / x is oldest cache.txt /tmp/*.tmp
Variable Check: x is unset VAR1 VAR2
Environment Detection: x is interactive / x is wsl / x is termux

Subcommands

Type

Command	Description
`int`	Integer check, batch supported
`float`	Float check (must contain decimal point)
`positive`	Positive integer (≥0)
`negative`	Negative integer (<0)
`minmax`	Range check `[MIN,MAX]`

Compare

Command	Description
`eq`	Multiple values equal
`within`	First value in candidate list
`in`	Colon-separated list member check
`in-`	Dash-separated list
`in_`	Underscore-separated list
`in/`	Slash-separated list
`in\|`	Pipe-separated list

Network

Command	Description
`ip`	IPv4 address check

File

Command	Description
`newest`	File newer than others (glob supported)
`oldest`	File older than others (glob supported)

Variable

Command	Description
`unset`	Variable is unset

Environment

Command	Description
`interactive`	Interactive session
`interactive_tty`	stdin is interactive TTY
`interactiveshell`	Shell is interactive
`repl`	REPL mode
`stdout2tty`	stdout outputs to TTY
`wsl`	WSL environment
`cygwin`	Cygwin environment
`msys`	MSYS/MinGW environment
`gitbash`	Git Bash environment
`termux`	Termux environment
`ish`	iSH environment

Suitability

Command	Description
`suitable_pkg`	Suitable for package installation
`suitable_advise_env`	Suitable for advise feature
`suitable_advise_repl`	Suitable for advise REPL

Practical Examples

Batch Type Validation

x is int 1 2 3 4 5 && echo "All integers"
x is float 3.14 -2.5 .5 && echo "All floats"

Environment Conditional Branch

x is interactive && echo "Interactive session" || echo "Script mode"
x is wsl && echo "WSL environment" || echo "Not WSL"
x is termux && echo "Termux environment"

File Status Check

x is newest build.tar.gz src/*.c lib/*.h || echo "Rebuild needed"

Variable Cleanup Verification

x is unset TEMP_VAR1 TEMP_VAR2 && echo "Temp variables cleaned"

Script Pre-flight Check

x is suitable_pkg || { echo "Environment not suitable"; exit 1; }

Design Principles

Batch First: Check multiple values at once, all must pass
Exit Code Semantics: 0 = success, 1 = failure, perfect for &&/|| chains
Silent: Validation tool outputs nothing, only exit code indicates result

Get Help

x is --help