castanyes blaves
Random ramblings about some random stuff, and things; but more stuff than things -- all in a mesmerizing and kaleidoscopic soapbox-like flow of words.1/19/2005
[$] head file
prints first 10 lines
[$] tail file
prints last 10 lines
[$] head -n 4 file
prints first 4 lines
[$] tail -n 4 file
prints last 4 lines
[$] head -c 200 file
prints first 200 characters
[$] tail -c 200 file
prints last 200 characters
[$] head file1 file2 file3
will print the specified number of lines from each file separating them with the header beginning with ==> followed by the name of the file.
[$] cat file1 file2 file3 | head or [$] head -q file1 file2 file3
will print the specified number of lines from the input stream made up of the files listed after the cat command, but treated as one single file.
[$] tail -f /var/log/access.log
-f option tells tail to keep on reading data from the specified file and feeding it to its own standard output.
[$] cat file | head -c 1788 | tail -c 789
to read a chunk of 789 bytes starting from byte 1000 counted from the beginning of that file
[$] tac file (Note that tac is cat spelled backwards.)
to reverse the order of lines in a file
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