dd conv=ascii if=100.PCN of=foo
On paging the 'foo' file i get conversion of the selected file. How can I get multiple 100.PCN's into 1 'foo' file.
Usually all my work related files have an extension of .PCN or 001. Upon selecting if=*.* No ouput file is generated. (2 Replies)
hi gurus ,,
I have multiple files with same file pattern..in a particular directory
for ex: file20061101.trf
file20061102.trf
file20061103.trf
Each of the file has a header as column names..
My questions is how can i eliminate the first row of each of these... (11 Replies)
I have a string that I need to append to 3 files.
Say,
$ echo "Hello"
I want to append this “Hello” to three files, file1, file2 and file3.The files are all in different directories and the file names have no common pattern.Can I do it in one line? If yes, how? :confused: (2 Replies)
Hopefully the title summarized what I need help with. I have multiple files that I would like to concatenate in bash.
ie:
cat file1 file2 file3 > bigfile
except I do not want to include the first line from each file (). Any help? Thanks. (6 Replies)
I have several files (around 50) that have the similar format. I need to extract the 5th line from every file and output that into a text file. So far, I have been able to figure out how to do it for a single file:
$ awk 'NR==5' text1.txt > results.txt
OR
$ sed -n '5p' text1.txt > results.txt... (6 Replies)
Hi,
I ran two crontab commands
using:
crontab program1
crontab program2
However when I type crontab -l only the second cron job shows up, how do I see all cron jobs running and how do I edit all at the same time
Thanks in Advance
S:D (10 Replies)
Hi everyone,
I've a requirement to modify an existing line which is common to multiple files. I need to replace that existing line with a new line. I've almost 900 ksh files to edit in the similar fashion in the same directory.
Example:
Existing Line: . $HOME/.eff.env (notice the "." at the... (3 Replies)
HI All,
I want to know if it is possible to print the same message but into 2 different files in the same command?
Something like
.
..
...
echo "Text" >> file1 && file2
this is because i creating a script which i use a log but i don't want to duplicate lines of command just to... (5 Replies)
I am looking for help in processing of those options: '-n' or '-p'
I understand what they do and how to use them.
But, I would like to use them with more than one file (and without any shell-loop; loading the 'perl' once.)
I did try it and -n works on 2 files.
Question is:
- is it possible to... (6 Replies)
Discussion started by: alex_5161
6 Replies
LEARN ABOUT FREEBSD
tail
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.
If the file being followed does not (yet) exist or if it is removed, tail will keep looking and will display the file from the begin-
ning if and when it is created.
The -F option is the same as the -f option 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.
EXAMPLES
To display the last 500 lines of the file foo:
$ tail -n 500 foo
Keep /var/log/messages open, displaying to the standard output anything appended to the file:
$ tail -f /var/log/messages
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 March 16, 2013 BSD