2016年9月27日 · When the script is done, any changes that it made to the environment are discarded. . script The above sources the script. It is as if the commands had been typed in directly. Any environment changes are kept. source script This also sources the script. The source command is not required by POSIX and therefore is less portable than the shorter ..

source is a shell keyword that is supposed to be used like this: source file where file contains valid shell commands. These shell commands will be executed in the current shell as if typed from the command line.

2 source is there for readability and self-documentation, . exists because it is quick to type. The commands are identical. Perl has long and short versions of many of its control variables for the same reason.

2019年2月27日 · The original sh sourced .profile on startup. bash will try to source .bash_profile first, but if that doesn't exist, it will source .profile 1. Note that if bash is started as sh (e.g. /bin/sh is a link to /bin/bash) or is started with the --posix flag, it tries to emulate sh, and only reads .profile. Footnotes: Actually, the first one of .bash_profile, .bash_login, .profile See also: Bash ...

You have an alias which is overriding the builtin source (fix with unalias source) You have a function which is overriding source (fix with unset -f source) You are somehow not using bash (although your bang line would suggest you are). source is not POSIX. Using source on dash does not work, only . works.

A dangerous one-liner that doesn't require source: export $(xargs <file) It can't handle comments, frequently used in environment files It can't handle values with whitespace, like in the question example It may unintentionally expand glob patterns into files if they match by any chance It's a bit dangerous because it passes the lines through bash expansion, but it …

2019年7月28日 · You could source the new file, which would work for some changes, possibly including updating the PATH variable (depending on other lines). However, sourcing it would simply run .zshrc again, and you might execute unexpected duplicate commands.

2014年8月28日 · I.e., unpack the source package from your distribution, replace the source with the upstream version, check if any of the distribution's patches or configuration tweaks still apply, build the binary package (make sure you changed the version of the packaged stuff!) and install that one. Yes, it is more work than just building and installing.

2020年7月30日 · I've read that BASH_SOURCE should be populated with the name of the executing script (and it works!). But why does BASH_SOURCE hold the name of the executing script, when it is defined in man bash as an array of source filenames corresponding to …

2016年7月5日 · And most allow multiple sources before the final target if it makes sense to do so. That includes scp. Some commands (like the GNU versions of cp and mv) have an option (e.g. -t or --target-directory=DIRECTORY) that allow you to put the target first - but the default is the standard "source (s) before target".