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This is basic but I am unable to google it. Can I use on invokation of grep to do
grep expr1 | grep expr2 so that it prints lines including both expr1 and expr2?
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If you want to find exact matches for multiple patterns, pass the -w flag to the grep command. As you can see, the results are different. The first command shows all lines with the strings you used. The second command shows how to grep exact matches for multiple strings.
Replace df -h with the command you want to use, and replace head -1 and grep '/$' with the two commands you want to apply to it. The output of both will be displayed in your terminal, though it may be that the output of the former command is displayed after the latter.
To search multiple files with the grep command, insert the filenames you want to search, separated with a space character. The terminal prints the name of every file that contains the matching lines, and the actual lines that include the required string of characters. You can append as many filenames as needed.
You can provide several expressions to search for with several -e flags. See also this post.
i.e.
grep -e expr1 -e expr2
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