Most of the time I look for Exception and Errors in log files and some time I know certain Exception I can ignore so I use grep -v option to exclude those Exceptions This grep command example will search for word “Exception” in and print them but since we have piped out of first grep command to second grep command which will exclude all lines which match world “ERROR”.
To make this grep example more concrete let’s see another example, here we have a file which contains three lines as shown below : Sometime we are not just interested on matching line but also on lines around matching lines particularly useful to see what happens before any Error or Exception.
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-mtime -1 (find all the files modified less than 1 day) . -mtime 1 (find all the files modified more than 1 day) ./.vimrc ./Online Stock ./Stock Trading.java~ .
You can used find –perm 444 to get all files which allows read to owner, group and others. -perm 644 ./.vimrc ./Online Stock find out all the executable files, you can also modify it to find all the read only files or files having write permission etc by changing permissions e.g.
`fgrep’ stands for Fixed `grep’, `egrep’ Extended `grep’ This will print all the lines in all files that contain the word “july” along with the file name.
If any of the files contain words like “JULY” or “July”, the above command would not print those lines. When you use a single file as input to the grep command to search for a pattern, it won’t print the filename in the output.
12) There are three version of grep command in UNIX `grep, fgrep, egrep’.
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How to Grow Hydrangea from Cuttings Hydrangeas are flowering deciduous plants that can range in size from small bushes to larger tree-like varieties.
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