From d762506863ad85bd65dbd24101b7b07720ddd864 Mon Sep 17 00:00:00 2001 From: koalaman Date: Tue, 26 Sep 2017 16:15:53 -0700 Subject: [PATCH] Updated SC2024 (markdown) --- SC2024.md | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/SC2024.md b/SC2024.md index 279c579..88ac7b9 100644 --- a/SC2024.md +++ b/SC2024.md @@ -1,12 +1,16 @@ -## sudo doesn't affect redirects. Use ..| sudo tee file +## `sudo` doesn't affect redirects. Use `..| sudo tee file` ### Problematic code: +``` sudo echo 'export FOO=bar' >> /etc/profile +``` ### Correct code: +``` echo 'export FOO=bar' | sudo tee -a /etc/profile > /dev/null +``` ### Rationale: @@ -18,15 +22,18 @@ There is nothing special about `tee`. It's just the simplest command that can bo Truncating: +``` echo 'data' | sudo dd of=file echo 'data' | sudo sed 'w file' +``` Appending: +``` echo 'data' | sudo awk '{ print $0 >> "file" }' echo 'data' | sudo sh -c 'cat >> file' - +``` ### Exceptions -If you want to run a command as root but redirect as the normal user, you can ignore this message. +If you want to run a command as root but redirect as the normal user, you can ignore this message.