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add tail usage

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Smicry 2021-10-19 00:15:17 +08:00
parent 40a895f79d
commit cb34b660cb
2 changed files with 11 additions and 3 deletions
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1
src/uu/head/src/head.rs
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@ -19,7 +19,6 @@ const BUF_SIZE: usize = 65536;
const ABOUT: &str = "\ const ABOUT: &str = "\
Print the first 10 lines of each FILE to standard output.\n\ Print the first 10 lines of each FILE to standard output.\n\
With more than one FILE, precede each with a header giving the file name.\n\ With more than one FILE, precede each with a header giving the file name.\n\
\n\
With no FILE, or when FILE is -, read standard input.\n\ With no FILE, or when FILE is -, read standard input.\n\
\n\ \n\
Mandatory arguments to long flags are mandatory for short flags too.\ Mandatory arguments to long flags are mandatory for short flags too.\

13
src/uu/tail/src/tail.rs
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@ -35,6 +35,15 @@ use crate::platform::stdin_is_pipe_or_fifo;
#[cfg(unix)] #[cfg(unix)]
use std::os::unix::fs::MetadataExt; use std::os::unix::fs::MetadataExt;
const ABOUT: &str = "\
Print the last 10 lines of each FILE to standard output.\n\
With more than one FILE, precede each with a header giving the file name.\n\
With no FILE, or when FILE is -, read standard input.\n\
\n\
Mandatory arguments to long flags are mandatory for short flags too.\
";
const USAGE: &str = "tail [FLAG]... [FILE]...";
pub mod options { pub mod options {
pub mod verbosity { pub mod verbosity {
pub static QUIET: &str = "quiet"; pub static QUIET: &str = "quiet";
@ -218,8 +227,8 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
pub fn uu_app() -> App<'static, 'static> { pub fn uu_app() -> App<'static, 'static> {
App::new(uucore::util_name()) App::new(uucore::util_name())
.version(crate_version!()) .version(crate_version!())
.about("output the last part of files") .about(ABOUT)
// TODO: add usage .usage(USAGE)
.arg( .arg(
Arg::with_name(options::BYTES) Arg::with_name(options::BYTES)
.short("c") .short("c")