From 7e4f7ffd1b4fce35dde5d4f3a45f5d56506bccff Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Tue, 5 Apr 2022 10:48:16 +0200
Subject: notes/bash: update

---
 _notes/bash.md | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

(limited to '_notes')

diff --git a/_notes/bash.md b/_notes/bash.md
index 1feef07..89d98fd 100644
--- a/_notes/bash.md
+++ b/_notes/bash.md
@@ -103,22 +103,23 @@ foo "$( bar )"    # Even with errexit, foo will still get executed.
 #### Do
 
 ```bash
-output="$( command )"
+shopt -s lastpipe
 
-while IFS= read -r line; do
+command | while IFS= read -r line; do
     process_line "$line"
-done <<< "$output"
+done
 ```
 
 #### Don't
 
 ```bash
-# This causes some bash insanity where you cannot change directories or set
-# variables inside a loop: http://mywiki.wooledge.org/BashFAQ/024
+# Without lastpipe, you cannot pipe into read:
 command | while IFS= read -r line; do
     process_line "$line"
 done
+```
 
+```bash
 # errexit doesn't work here no matter what:
 while IFS= read -r line; do
     process_line "$line"
@@ -126,6 +127,15 @@ done < <( command )
 echo 'should never see this'
 ```
 
+```bash
+# This would break if $output contains the \0 byte:
+output="$( command )"
+
+while IFS= read -r line; do
+    process_line "$line"
+done <<< "$output"
+```
+
 ### Functions
 
 #### Do
-- 
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