You can also select your default terminal by pressing F1 in Visual Studio Code and typing/selecting Terminal: Select Default Profile (or Terminal: Select Default Shell in older Visual Studio Code versions). Older:
date +”%T.%N” returns the current time with nanoseconds. 06:46:41.431857000 date +”%T.%6N” returns the current time with nanoseconds rounded to the first 6 digits, which is microseconds. 06:47:07.183172 date +”%T.%3N” returns the current time with nanoseconds rounded to the first 3 digits, which is milliseconds. 06:47:42.773 In general, every field of the date command’s format can … Read more
You could use this construct: export LD_LIBRARY_PATH=/mypath${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH} Explanation: If LD_LIBRARY_PATH is not set, then ${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH} expands to nothing without evaluating $LD_LIBRARY_PATH, thus the result is equivalent to export LD_LIBRARY_PATH=/mypath and no error is raised. If LD_LIBRARY_PATH is already set, then ${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH} expands to :$LD_LIBRARY_PATH, thus the result is equivalent to export LD_LIBRARY_PATH=/mypath:$LD_LIBRARY_PATH. See the Bash … Read more
A bit late to the party but for the benefit of others, I found the ‘w’ flag to be exactly what I was looking for. sed -i “s/$pattern/$new_pattern/w changelog.txt” “$filename” if [ -s changelog.txt ]; then # CHANGES MADE, DO SOME STUFF HERE else # NO CHANGES MADE, DO SOME OTHER STUFF HERE fi changelog.txt … Read more
Try adding -e if it’s not working without it You may need to add the -e option to echo (at least that’s required on all or most systems I use). The following will tell your system to blink the text: echo -e “\033[5mTitle of the Program\033[0m” You can have blinking and color And you don’t … Read more
You can use tr to delete all of the non-digit characters, like so: echo toto.titi.12.tata.2.abc.def | tr -d -c 0-9
You can use the command built-in to suppress shell function lookups. command: command [-pVv] command [arg …] Execute a simple command or display information about commands. Runs COMMAND with ARGS suppressing shell function lookup, or display information about the specified COMMANDs. Can be used to invoke commands on disk when a function with the same … Read more
Unquoted, there is no difference — they’re expanded to all the arguments and they’re split accordingly. The difference comes when quoting. “$@” expands to properly quoted arguments and “$*” makes all arguments into a single argument. Take this for example: #!/bin/bash function print_args_at { printf “%s\n” “$@” } function print_args_star { printf “%s\n” “$*” } … Read more
Yes, you should always use it. People make fun of Visual Basic all the time, saying it’s not a real programming language, partly because of its “On Error Resume Next” statement. Yet that is the default in shell! set -e should have been the default. The potential for disaster is just too high. In places … Read more
You can use the r command. When you find a ‘fox’ in the input… /fox/{ …replace it for nothing… s/fox//g …and read the input file: r f.html } If you have a file such as: $ cat file.txt the quick brown fox jumps over the lazy dog fox dog the result is: $ sed ‘/fox/{ … Read more