Difference between revisions of "Introduction to Linux in HPC/Text display search"
Introduction to Linux in HPC/Text display search
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| − | + | + | + Klick and submit to see the answer |
|| Explanation: grep -rnw '/path/to/somewhere/' -e 'pattern' | || Explanation: grep -rnw '/path/to/somewhere/' -e 'pattern' | ||
| − | + | || -r or -R is recursive, | |
| − | + | || -n is line number, and | |
| − | + | || -w stands for match the whole word. | |
| − | + | || -l (lower-case L) can be added to just give the file name of matching files. | |
</quiz> | </quiz> | ||
{{hidden end}} | {{hidden end}} | ||
Revision as of 18:08, 1 October 2020
Video
Linux Introduction Slides 58 - 64 (7 pages)
Slide Layout
page 1:
grep command and syntax
important options: -r, -i and -I
page 2:
many commands to display text
cat
less
head and tail
page 3: 40 sec
console has three streams
stdin
stdout
stderr
page 4:
stream in computing terms
similar to streaming video
input/output stream in console
page 5:
input/output streams can be redirected
redirect stdout
redirect stdin
pipe
page 6:
stream append redirection
numbered streams: 0 for stdin, 1 for stdout, 2 for stderr
page 7:
use grep to search piped output text
Quiz
1. Which command can be used to append text to filename?
2. How do I find all files containing specific text on Linux?
HINT: use grep command
HINT: use grep command
| Info: | no tips in this section |