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If you are looking for just three character on a line (not zero, one or two & not four or more) then you need to mark the beginning and end of the line in your expression. The carat ^ marks the...

just ... match every 3 suppose if your line contains 6 or 9 char string then also it matches, 3 char as one set.

Execute this on your terminal, you will come to know

# considers 5 digits pairs ...

Cache is not technically needed. It's not like a file handle, where you must have one to do anything. It's just a copy of data held in memory in case you need to read it again, which makes future...

See in bold.

First, you forgot the struct name, so after "typedef struct" I added "node". This makes it "struct node". This is where you were having the "undefined type" problems, because...

Note that, at least for ksh93, in the obsolete form `...`, the string between the quotes is processed for special quoting characters before the command is executed. This does not occur with $(...)

$(...) spawns a shell for executing the commands. It is similar to `...`

So $( grep -l Hello * ) will output a file name which is fed to cat and thus the it is as good as cat file_name
...

hi sreeharshasn

looks like /opt/perl5.10.0/perl is on mount point which is mounted using autofs
which drops the mount point after certain period of idle time.

when u do ls -lrt...

I suspect this error might be caused by /opt/perl5.10.0 being a link or a mountpoint to a remote file server and the latter service being faulty.