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Implement tail -<number> (#2747)

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And add obsolete_syntax test
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Smicry 2021-11-20 04:37:47 +08:00 • committed by GitHub
parent 00769af807
commit fc851e036b
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3 changed files with 313 additions and 75 deletions
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30
tests/by-util/test_tail.rs
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@ -358,6 +358,36 @@ fn test_positive_lines() {
.stdout_is("c\nd\ne\n");
}
/// Test for reading all but the first NUM lines: `tail -3`.
#[test]
fn test_obsolete_syntax_positive_lines() {
new_ucmd!()
.args(&["-3"])
.pipe_in("a\nb\nc\nd\ne\n")
.succeeds()
.stdout_is("c\nd\ne\n");
}
/// Test for reading all but the first NUM lines: `tail -n -10`.
#[test]
fn test_small_file() {
new_ucmd!()
.args(&["-n -10"])
.pipe_in("a\nb\nc\nd\ne\n")
.succeeds()
.stdout_is("a\nb\nc\nd\ne\n");
}
/// Test for reading all but the first NUM lines: `tail -10`.
#[test]
fn test_obsolete_syntax_small_file() {
new_ucmd!()
.args(&["-10"])
.pipe_in("a\nb\nc\nd\ne\n")
.succeeds()
.stdout_is("a\nb\nc\nd\ne\n");
}
/// Test for reading all lines, specified by `tail -n +0`.
#[test]
fn test_positive_zero_lines() {