You can use the -i flag which makes your pattern case insensitive: Also, there is no need for cat. grep takes a file with the syntax grep <pattern> <file>. I also used the -F flag to search for a fixed string to avoid escaping the ellipsis.
I think this is what you want: I’ve used the -P switch to get perl regex.
File descriptor 1 is the standard output (stdout).File descriptor 2 is the standard error (stderr). Here is one way to remember this construct (although it is not entirely accurate): at first, 2>1 may look like a good way to redirect stderr to stdout. However, it will actually be interpreted as “redirect stderr to a file named 1“. & indicates that what follows and precedes is … Read more
export is used to set environment variable in operating system. This variable will be available to all child processes created by current Bash process ever after. PS1 is the primary prompt which is displayed before each command, thus it is the one most people customize. read more: https://wiki.archlinux.org/index.php/Bash/Prompt_customization#Prompts And the statement: \[\033[36m\]\u\[\033[m\]@\[\033[32m\]\h:\[\033[33;1m\]\w\[\033[m\]\$dictates how the prompt is going to look … Read more
This is what I did, it should work: It worked for the two dates given above… If you want to customize the date output, add a format string at the end of the FINALDATe assignment.
Using variables in if statements If you want to do something when they don’t match, replace = with !=. You can read more about string operations and arithmetic operations in their respective documentation. Why do we use quotes around $x? You want the quotes around $x, because if it is empty, your Bash script encounters … Read more
The following reads a file passed as an argument line by line: This is the standard form for reading lines from a file in a loop. Explanation: IFS= (or IFS=”) prevents leading/trailing whitespace from being trimmed. -r prevents backslash escapes from being interpreted. Or you can put it in a bash file helper script, example … Read more
You should use #!/usr/bin/env bash for portability: different *nixes put bash in different places, and using /usr/bin/env is a workaround to run the first bash found on the PATH. And sh is not bash.
File descriptor 1 is the standard output (stdout).File descriptor 2 is the standard error (stderr). Here is one way to remember this construct (although it is not entirely accurate): at first, 2>1 may look like a good way to redirect stderr to stdout. However, it will actually be interpreted as “redirect stderr to a file … Read more
Depending on what you want the file to contain: touch /path/to/file for an empty file somecommand > /path/to/file for a file containing the output of some command. eg: grep –help > randomtext.txt echo “This is some text” > randomtext.txt nano /path/to/file or vi /path/to/file (or any other editor emacs,gedit etc)It either opens the existing one for editing or creates & opens … Read more