Type some part of the command, and then hit the ↑ (up) or ↓ (down) arrow keys to navigate through history matches, or press Control+ R to open the history in a searchable pager. I’m getting weird graphical glitches (a staircase effect, ghost characters, cursor in the wrong position,…)?.Why won’t SSH/SCP/rsync connect properly when fish is my login shell?.I accidentally entered a directory path and fish changed directory.My command prints “No matches for wildcard” but works in bash.How do I get the exit status of a command?.My command (pkg-config) gives its output as a single long string?.How do I run a subcommand? The backtick doesn’t work!.Why doesn’t history substitution (“!$” etc.) work?. ![]() How do I customize my syntax highlighting colors?.How do I run a command every login? What’s fish’s equivalent to.Why doesn’t set -Ux (exported universal variables) seem to work?.How do I check whether a variable is not empty?.How do I check whether a variable is defined?.How do I set or clear an environment variable?.What is the equivalent to this thing from bash (or other shells)?.Simply carries out the actions contained in that file. ![]() & means run the next command is the previous is successful and source ~/.bash_profile ( NB be very careful as > will redirect to the file and overwrite it rather than appending.) > is then used to redirect stdout to the end of the ~/.bash_profile file. On my system because using $PATH within double quotes means bash will substitute it with its value. (stdout, stderr and stdin are very important concepts on UNIX systems but rather off topic) Running this command produces the result: export PATH=/usr/local/bin:/opt/local/sbin:/opt/local/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin Simply prints or echoes what follows to stdout, which in the above instance is the terminal. To explain echo "export PATH=/usr/local/bin:$PATH" To fix it you want: echo "export PATH=/usr/local/bin:$PATH" > ~/.bash_profile & source ~/.bash_profile To your shell Path and PATH are very different things. ![]() The mistake in the line you've provided is that only the first letter of PATH is capitalised. bash_profile is a text file stored in your home directory that is sourced (read) every time bash (your shell) starts. What the command you have provided is trying to do is add a line to your. This means that any executables you install with brew will be used in preference to the system defaults. Adding /usr/local/bin to the beginning of PATH means that the shell will search there first and so if you have an executable foo in that folder it will be used in preference to any other foo executables you may have in the folders in your path. You can see what is in your PATH currently (as you can with all environment variables) by entering: echo $Īs I mentioned earlier, ordering is important. The PATH environment variable therefore saves you some extra typing. Thus fully the command is /bin/mv foo bar When you use a command that is not built into the shell you are using the shell will search through these directories in order and will execute the first matching executable it finds.įor example when you type: mv foo bar the shell is almost certainly actually using an executable located in the /bin directory. The PATH environment variable is a list of directories that the shell uses to search for executables. To answer your first question in order to run (execute) a program (executable) the shell must know exactly where it is in your filesystem in order to run it. TL DR echo "export PATH=/usr/local/bin:$PATH" > ~/.bash_profile & source ~/.bash_profile
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