11-12-2008
in both ways if you wrote tail -1 | wc -l, the answer will always be one.
What do u want exactly, do you want to know if the last line is empty ?
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I have a file which has the first blank line:
sundev22$cat /t1/bin/startallocs
/t1/bin/startallocsys 123
sundev22$
Is there a command to remove this first blank line? Thanks for help -A (4 Replies)
Discussion started by: aoussenko
4 Replies
2. Shell Programming and Scripting
I have a number of files (arranged in directories) which have last line blank,
I am trying to synchronize my code with other env and due to this blank lines, all files error out as different although only difference is that of balnk line at end of file.
Is there a way I can recursively... (2 Replies)
Discussion started by: ruchimca
2 Replies
3. Shell Programming and Scripting
I want to get the blank line number of a file.
example:
9000|9000|WW|1|1|SL|472|472|LC|2272|1072|MTY|niceDay
9000|9000|WW|1|1|SL|470|470|MC|1270|1172|MPVT|nice
9000|9000|WW|1|1|SL|472|472|LC|1072|1672|MBD|Sonice
9000|9000|WW|1|1|SL|473|473|LF|1173|1173|MTY|nice666
I want to get... (5 Replies)
Discussion started by: robbiezr
5 Replies
4. Shell Programming and Scripting
Hi,
sumdays before i had posted a query with same subject.
i got sum great help from great ppl which solved my problem then.
But now there is a small problem with the code that i need the experts help upon.
for parsing a text
like this
where $ had been the delimiter between... (3 Replies)
Discussion started by: suresh_kb211
3 Replies
5. Shell Programming and Scripting
Hi
I nned cmd to which will help me to replace a line in file with blank line
e.g.
file1
a
b
c
d
e
after running cmd I shud get
file1
b
c
d
e (5 Replies)
Discussion started by: tarunn.dubeyy
5 Replies
6. Shell Programming and Scripting
Hi Guys,
I have a file in which each set of records are separated by two blank line. I want to replace it with a single blank line.
Can you guys help me out?
Regards,
Magesh (9 Replies)
Discussion started by: mac4rfree
9 Replies
7. Shell Programming and Scripting
I have a file with data as below :
Heading 1
-------------
Heading 1 data1
Heading 1 data2
Heading 1 data3
Heading 1 data4
Heading 2
-------------
Heading 2 data1
Heading 2 data2
Heading 2 data3
Heading 2 data4
Heading 3
-------------
Heading 3 data1
Heading 3 data2
Heading 3... (2 Replies)
Discussion started by: yoursdivu
2 Replies
8. Shell Programming and Scripting
Hi all,
I have file1 with line blank e.g.
$cat file1
aaa 111 222 333 444
bbb 555 666 777 888
ccc
ddd 1010 1010 1010
eee
then i need delete the lines blank (3 and 5) so show
$cat file1
aaa 111 222 333 444
bbb 555 666 777 888
ddd 1010 1010 1010 (5 Replies)
Discussion started by: aav1307
5 Replies
9. Shell Programming and Scripting
Dear All,
In a CSV file, say that a given column has been extracted. In that column, information is missing (i.e. blank lines appear). I would like to replace the blank lines by the last valid line (not blank) previously read.
For example, consider the extract below:
123
234
543
111... (7 Replies)
Discussion started by: bagvian
7 Replies
10. UNIX for Beginners Questions & Answers
PGW|PGW_CDR_|2017-06-23 141946|2017-07-17 131633|2017-08-21
PGW|PGW_CDR_|2017-06-23 141946|2017-07-17 131633|2017-08-21
PGW|PGW_CDR_|2017-06-23 141946|2017-07-17 131633|2017-08-21
PGW|PGW_CDR_|2017-06-23 141946|2017-07-17 131633|2017-08-21
PGW|PGW_CDR_|2017-06-23 141946|2017-07-17... (6 Replies)
Discussion started by: swathi reddy1
6 Replies
TAIL(1) BSD General Commands Manual TAIL(1)
NAME
tail -- display the last part of a file
SYNOPSIS
tail [-F | -f | -r] [-q] [-b number | -c number | -n number] [file ...]
DESCRIPTION
The tail utility displays the contents of file or, by default, its standard input, to the standard output.
The display begins at a byte, line or 512-byte block location in the input. Numbers having a leading plus ('+') sign are relative to the
beginning of the input, for example, ``-c +2'' starts the display at the second byte of the input. Numbers having a leading minus ('-') sign
or no explicit sign are relative to the end of the input, for example, ``-n 2'' displays the last two lines of the input. The default start-
ing location is ``-n 10'', or the last 10 lines of the input.
The options are as follows:
-b number
The location is number 512-byte blocks.
-c number
The location is number bytes.
-f The -f option causes tail to not stop when end of file is reached, but rather to wait for additional data to be appended to the
input. The -f option is ignored if the standard input is a pipe, but not if it is a FIFO.
-F The -F option implies the -f option, but tail will also check to see if the file being followed has been renamed or rotated. The
file is closed and reopened when tail detects that the filename being read from has a new inode number. The -F option is ignored if
reading from standard input rather than a file.
-n number
The location is number lines.
-q Suppresses printing of headers when multiple files are being examined.
-r The -r option causes the input to be displayed in reverse order, by line. Additionally, this option changes the meaning of the -b,
-c and -n options. When the -r option is specified, these options specify the number of bytes, lines or 512-byte blocks to display,
instead of the bytes, lines or blocks from the beginning or end of the input from which to begin the display. The default for the -r
option is to display all of the input.
If more than a single file is specified, each file is preceded by a header consisting of the string ``==> XXX <=='' where XXX is the name of
the file unless -q flag is specified.
EXIT STATUS
The tail utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
cat(1), head(1), sed(1)
STANDARDS
The tail utility is expected to be a superset of the IEEE Std 1003.2-1992 (``POSIX.2'') specification. In particular, the -F, -b and -r
options are extensions to that standard.
The historic command line syntax of tail is supported by this implementation. The only difference between this implementation and historic
versions of tail, once the command line syntax translation has been done, is that the -b, -c and -n options modify the -r option, i.e., ``-r
-c 4'' displays the last 4 characters of the last line of the input, while the historic tail (using the historic syntax ``-4cr'') would
ignore the -c option and display the last 4 lines of the input.
HISTORY
A tail command appeared in PWB UNIX.
BSD
June 29, 2006 BSD