hello everyone, i'm taking a class on unix and linux, and have come across a problem that my teacher couldn't figure out either:
the testing file i'm using:
Code:
This is a test of grep
to see how inversion really works
and figure out the problem that the class is having
hopefully this works
so here's some things i've tried:
Code:
cat test|grep 'figure'
output:
and figure out the problem that the class is having
cat test|grep -A 1 'figure'
output:
and figure out the problem that the class is having
hopefully this works
and here's the problem:
cat test|grep -v -A 1 'figure'
output:
This is a test of grep
to see how inversion really works
and figure out the problem that the class is having
hopefully this works
so, why does grep behave like that?, i thought that the output would be:
Code:
This is a test of grep
to see how inversion really works
instead it acts like it broke, and outputs the entire file, any help is much appreciated
ok, i see thanks very much for your answer, this helps me understand what is going on, is their any way to achieve the output i desired with just grep or would i have to pipe it into other functions to achieve the output i desire?
that works on the small scale like here, but the end goal has 11 lines in front of, and 17 lines behind, and i only know of 1 point between those lines that is unique, the rest is repeated multiple times in the file, which is why i was hoping to figure this out with grep
ahh, didn't know that(i was taught piping in from cat, thanks)
however with the first grep -v -A 1 'figure' test, the output is the same as the input, making the second grep act the same inversing just that line, and not the last two lines
output of grep -v -A 1 figure test:
Code:
This is a test of grep
to see how inversion really works
and figure out the problem that the class is having
hopefully this works
and piped into the second grep:
Code:
This is a test of grep
to see how inversion really works
hopefully this works
which would be the same as doing grep -v 'figure' test
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