Hi Guys,
I wish to compare two ebcdic files.
diff utility manual says it only compares two text files line by line.. I doubt this will be good for ebcdic files.
cmp utility does binary comparision but I do not find any thing in manual referring if it does support ebcdic file format.
let... (2 Replies)
Can you please help me with writing script for following purpose.
I have to divide single large web access log file into multiple log files based on dates inside the log file.
For example:
if data is logged in the access file for jan-10-08 , jan-11-08 , Jan-12-08
then make small log file... (1 Reply)
Hi all,
I have three files, one is a navigation file, one is a depth file and one is a file containing the measured field of gravity. The formats of the files are;
navigation file:
2006 320 17 39 0 0 *nav 21.31542 -157.887
2006 320 17 39 10 0 *nav 21.31542 -157.887
2006 320 17 39 20 0... (2 Replies)
I need a script (perl or awk..anything is fine) to join 3 files based on three key columns. The no of non-key columns can vary in each file. The columns are delimited by semicolon.
For example,
File1
Dim1;Dim2;Dim3;Fact1;Fact2;Fact3;Fact4;Fact5
---- data delimited by semicolon ---
... (1 Reply)
Hey everyone.
I am trying to figure out a way to create a file that will be renamed based off of one of multiple files. For example, if I have 3 files (cat.ctl, dog.ctl, and bird.ctl) that gets placed on to an ftp site I want to create a single file called new.cat.ctl, new.dog.ctl, etc for each... (3 Replies)
Dear Gurus,
I am a novice in shell scripts. I have a requirement where I need to move files every day from Current Folder to Archive folder.
Daily I will be receiving 5 files in the folder - /opt/data/feeds/.
The feeds folder has two sub-folders - Current and Archive.
For example the... (25 Replies)
Hi,
I have a file abc.dat. It contains the fileds of empid, empname, empcity. each city contains 10 records. i want to create the city file and pass the same city records into the file. I don't know the city names.
In unix using awk command how can we do?
abc.dat:
1 john delhi
2... (2 Replies)
I want to search for a particular file name patterns and move them to a specific folder, is it possible to do it with awk or sed? (1 Reply)
Discussion started by: rudoraj
1 Replies
LEARN ABOUT BSD
dd
DD(1) General Commands Manual DD(1)NAME
dd - convert and copy a file
SYNOPSIS
dd [option=value] ...
DESCRIPTION
Dd copies the specified input file to the specified output with possible conversions. The standard input and output are used by default.
The input and output block size may be specified to take advantage of raw physical I/O.
option values
if= input file name; standard input is default
of= output file name; standard output is default
ibs=n input block size n bytes (default 512)
obs=n output block size (default 512)
bs=n set both input and output block size, superseding ibs and obs; also, if no conversion is specified, it is particularly effi-
cient since no copy need be done
cbs=n conversion buffer size
skip=n skip n input records before starting copy
files=n copy n input files before terminating (makes sense only where input is a magtape or similar device).
seek=n seek n records from beginning of output file before copying
count=n copy only n input records
conv=ascii convert EBCDIC to ASCII
ebcdic convert ASCII to EBCDIC
ibm slightly different map of ASCII to EBCDIC
block convert variable length records to fixed length
unblock convert fixed length records to variable length
lcase map alphabetics to lower case
ucase map alphabetics to upper case
swab swap every pair of bytes
noerror do not stop processing on an error
sync pad every input record to ibs
... , ... several comma-separated conversions
Where sizes are specified, a number of bytes is expected. A number may end with k, b or w to specify multiplication by 1024, 512, or 2
respectively; a pair of numbers may be separated by x to indicate a product.
Cbs is used only if ascii, unblock, ebcdic, ibm, or block conversion is specified. In the first two cases, cbs characters are placed into
the conversion buffer, any specified character mapping is done, trailing blanks trimmed and new-line added before sending the line to the
output. In the latter three cases, characters are read into the conversion buffer, and blanks added to make up an output record of size
cbs.
After completion, dd reports the number of whole and partial input and output blocks.
For example, to read an EBCDIC tape blocked ten 80-byte EBCDIC card images per record into the ASCII file x:
dd if=/dev/rmt0 of=x ibs=800 cbs=80 conv=ascii,lcase
Note the use of raw magtape. Dd is especially suited to I/O on the raw physical devices because it allows reading and writing in arbitrary
record sizes.
SEE ALSO cp(1), tr(1)DIAGNOSTICS
f+p records in(out): numbers of full and partial records read(written)
BUGS
The ASCII/EBCDIC conversion tables are taken from the 256 character standard in the CACM Nov, 1968. The `ibm' conversion, while less
blessed as a standard, corresponds better to certain IBM print train conventions. There is no universal solution.
One must specify ``conv=noerror,sync'' when copying raw disks with bad sectors to insure dd stays synchronized.
Certain combinations of arguments to conv= are permitted. However, the block or unblock option cannot be combined with ascii, ebcdic or
ibm. Invalid combinations silently ignore all but the last mutually-exclusive keyword.
4th Berkeley Distribution April 29, 1985 DD(1)