The simplest and most widely available method to get user input at a shell prompt is the read command. The best way to illustrate its use is a simple demonstration: while true; do read -p “Do you wish to install this program? ” yn case $yn in [Yy]* ) make install; break;; [Nn]* ) exit;; … Read more
This is, in effect, a way to check whether the expression e can be evaluated to be 0, and if not, to fail the build. The macro is somewhat misnamed; it should be something more like BUILD_BUG_OR_ZERO, rather than …ON_ZERO. (There have been occasional discussions about whether this is a confusing name.) You should read … Read more
One way to do it is: while read p; do echo “$p” done <peptides.txt As pointed out in the comments, this has the side effects of trimming leading whitespace, interpreting backslash sequences, and skipping the last line if it’s missing a terminating linefeed. If these are concerns, you can do: while IFS=”” read -r p … Read more
If -prune doesn’t work for you, this will: find -name “*.js” -not -path “./directory/*” Caveat: requires traversing all of the unwanted directories.
Use: npm update -g npm See the docs for the update command: npm update [-g] [<pkg>…] This command will update all the packages listed to the latest version (specified by the tag config), respecting semver. Additionally, see the documentation on Node.js and NPM installation and Upgrading NPM. The following original answer is from the old … Read more
grep -r “texthere” . The first parameter represents the regular expression to search for, while the second one represents the directory that should be searched. In this case, . means the current directory. Note: This works for GNU grep, and on some platforms like Solaris you must specifically use GNU grep as opposed to legacy … Read more
If your goal is to use a profiler, use one of the suggested ones. However, if you’re in a hurry and you can manually interrupt your program under the debugger while it’s being subjectively slow, there’s a simple way to find performance problems. Just halt it several times, and each time look at the call … Read more
unset is the command you’re looking for. unset GNUPLOT_DRIVER_DIR
To create a new symlink (will fail if symlink exists already): ln -s /path/to/file /path/to/symlink To create or update a symlink: ln -sf /path/to/file /path/to/symlink
The other answers are correct, in that chmod -R 755 will set these permissions to all files and subfolders in the tree. But why on earth would you want to? It might make sense for the directories, but why set the execute bit on all the files? I suspect what you really want to do … Read more