From: josh.cheek@... Date: 2018-01-28T15:57:40+00:00 Subject: [ruby-core:85185] [Ruby trunk Bug#14413] `-n` and `-p` flags break when stdout is closed Issue #14413 has been updated by josh.cheek (Josh Cheek). nobu (Nobuyoshi Nakada) wrote: > A patch to exit with SIGPIPE when `EPIPE` if `-n` or `-p` option is given. ������ ������ ���� ---------------------------------------- Bug #14413: `-n` and `-p` flags break when stdout is closed https://bugs.ruby-lang.org/issues/14413#change-69930 * Author: josh.cheek (Josh Cheek) * Status: Feedback * Priority: Normal * Assignee: * Target version: * ruby -v: ruby 2.5.0preview1 (2017-10-10 trunk 60153) [x86_64-darwin16] * Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN ---------------------------------------- Ruby generally works well within a pipeline. The `-n` and `-p` flags are incredibly useful. However, it is common practice to use programs like `head` and `sed`, which will close the pipe after completing their job. This is convenient, because often it limits an expensive amount of output to a workable subset. I can figure out the pipeline for a subset of input, and then remove the limiting function. However, Ruby explodes with `-e:1:in `write': Broken pipe @ io_write - (Errno::EPIPE)`, when it writes the current line to stdout. When in a line oriented mode, and stdout closes, I think it should exit successfully (so it doesn't break bash scripts with `pipe fail`set) and silently (no error message), hence marking this a bug report rather than a feature request. I've attached a screenshot to show that this is how every other program works, that I tried. ~~~ git clone https://github.com/jquery/esprima cd esprima/test/fixtures/ ls | head -1 # ls find . -type f -name '*json' | head -1 # find find . -type f -name '*json' | head -1 | xargs cat | jq . | head -1 # jq find . -type f -name '*json' | grep -v JSX | grep -v tokenize | head -1 # grep find . -type f -name '*json' | sed -E '/JSX|tokenize/d' | head -1 # sed find . -type f -name '*json' | awk '/JSX|tokenize/ { next }; { print }' | head -1 # awk find . -type f -name '*json' | perl -e 'while(<>) { /JSX|tokenize/ || print }' | head -1 # perl find . -type f -name '*json' | ruby -ne 'print unless /JSX|tokenize/' | head -1 # ruby :( ~~~ ---Files-------------------------------- Screen Shot 2018-01-27 at 7.27.49 PM.png (458 KB) -- https://bugs.ruby-lang.org/ Unsubscribe: