08-20-2013
Hardest first: null is not handled by most tools. 'cat -v' can turn it into '^@' C/C++/PERL/JAVA/etc. can read byte by byte and translate anything. grep can print line numbers and lines containing [^ -~] (not between the space and tilde characters, the ASCII non-control characters).
Text does not normally have such, so the concept of lines and line numbers is funny. File names are in directories not flat files, generally, but a flat file could have a file name in it, if you can figure out how to frame it. Are you describing a process ot examine many files?
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
i have this text file name test.txt which contain :
aaaaa bbb
iiiiiiiiiiiii ccf
ddaaa ddd
and i need a script that can print out the line numbers using a while loop..
so when the script is run..it will have this:
1
2
3
any ideas? :) thanks guys (4 Replies)
Discussion started by: forevercalz
4 Replies
2. Shell Programming and Scripting
Hi folks,
I am looking for a solution to display those lines in any file that contains 80 or more characters along with their corresponding line number in the file.
The below script will print the lines with their corresponding line numbers...
sed = Sample.cpp | sed 'N;s/\n/\t/;... (8 Replies)
Discussion started by: frozensmilz
8 Replies
3. Shell Programming and Scripting
I know this should be simple, but I've been manning sed awk grep and find and am stupidly stumped :(
I'm trying to use sed (or awk, find, etc) to find 4 characters on the second line of a file.txt 44-47 characters in. I can find lots of sed things for lines, but not characters. (4 Replies)
Discussion started by: unclecameron
4 Replies
4. Shell Programming and Scripting
Hi,
I would like to know how to solve one of my problems using expert unix commands.
I have a file with occasional blank lines;
for example;
dertu
frthu
fghtu
frtty
frtgy
frgtui
frgtu
ghrye
frhutp
frjuf
I need to edit the file so that the file looks like this; (10 Replies)
Discussion started by: Lucky Ali
10 Replies
5. Shell Programming and Scripting
Hi Experts,
Please let me know, how to generate control characters in a file.
I want to test my script which will check for any control characters in a file before loading the data into the PRD Database.
Thanks in Advance,
Sapy. (2 Replies)
Discussion started by: saps19
2 Replies
6. Shell Programming and Scripting
Hi, I'm having trouble with awk print all characters between 2 patterns. I tried more then one solution found on this forum but with no success.
Probably my mistakes are due to the special characters "" and "]"in the search patterns.
Well, have a log file like this:
logfile.txt
... (3 Replies)
Discussion started by: ginolatino
3 Replies
7. Shell Programming and Scripting
Hi
I have 2 files with following data
First file,
sp|Q676U5|A16L1_HUMAN,
Autophagy-related protein 16-1 OS=Homo sapiens GN=ATG16L1 PE=1 SV=2,
Maximum coiled-coil residue probability: 0.657 in position 163.
Maximum dimeric residue probability: 0.288 in position 163.
... (1 Reply)
Discussion started by: manigrover
1 Replies
8. UNIX for Dummies Questions & Answers
I have a file that includes strings with special characters, eg
file1
line: 1 - special 1
line: = 4
line; -3
etc
How can I grep the lines of file1 from file2, line by line?
I used fgrep and egrep to grep a particular line and worked fine, but when I used:
cat file1|while read line;do... (2 Replies)
Discussion started by: FelipeAd
2 Replies
9. Shell Programming and Scripting
Hi All,
I want to keep the name of the songs with their respective extensions only.
Sample Code
========
03 Choti choti gaiya choti choti gaval.mp3
03---Brazil Dhol.mp3
03 PAYALIYA .mp3
04 - Isq Risk .mp3
04%20-%20Oh%20My%20Love(wapking.in).mp3
08 - A2 - Aasan Nahin Yahan .mp3
AE... (3 Replies)
Discussion started by: Pramod_009
3 Replies
10. UNIX for Beginners Questions & Answers
Hi Team,
I have a file a1.txt with data as follows.
dfjakjf...asdfkasj</EnableQuotedIDs><SQL><SelectStatement modified='1' type='string'><!
The delimiter string: <SelectStatement modified='1' type='string'><!
dlm="<SelectStatement modified='1' type='string'><!
The above command is... (7 Replies)
Discussion started by: kmanivan82
7 Replies
cat(1) User Commands cat(1)
NAME
cat - concatenate and display files
SYNOPSIS
cat [-nbsuvet] [file...]
DESCRIPTION
The cat utility reads each file in sequence and writes it on the standard output. Thus:
example% cat file
prints file on your terminal, and:
example% cat file1 file2 >file3
concatenates file1 and file2, and writes the results in file3. If no input file is given, cat reads from the standard input file.
OPTIONS
The following options are supported:
-n Precede each line output with its line number.
-b Number the lines, as -n, but omit the line numbers from blank lines.
-u The output is not buffered. (The default is buffered output.)
-s cat is silent about non-existent files.
-v Non-printing characters (with the exception of tabs, new-lines and form-feeds) are printed visibly. ASCII control characters
(octal 000 - 037) are printed as ^n, where n is the corresponding ASCII character in the range octal 100 - 137 (@, A, B, C, . . .,
X, Y, Z, [, , ], ^, and _); the DEL character (octal 0177) is printed ^?. Other non-printable characters are printed as M-x,
where x is the ASCII character specified by the low-order seven bits.
When used with the -v option, the following options may be used:
-e A $ character will be printed at the end of each line (prior to the new-line).
-t Tabs will be printed as ^I's and formfeeds to be printed as ^L's.
The -e and -t options are ignored if the -v option is not specified.
OPERANDS
The following operand is supported:
file A path name of an input file. If no file is specified, the standard input is used. If file is `-', cat will read from the
standard input at that point in the sequence. cat will not close and reopen standard input when it is referenced in this
way, but will accept multiple occurrences of `-' as file.
USAGE
See largefile(5) for the description of the behavior of cat when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).
EXAMPLES
Example 1: Concatenating a file
The following command:
example% cat myfile
writes the contents of the file myfile to standard output.
Example 2: Concatenating two files into one
The following command:
example% cat doc1 doc2 > doc.all
concatenates the files doc1 and doc2 and writes the result to doc.all.
Example 3: Concatenating two arbitrary pieces of input with a single invocation
The command:
example% cat start - middle - end > file
when standard input is a terminal, gets two arbitrary pieces of input from the terminal with a single invocation of cat. Note, however,
that if standard input is a regular file, this would be equivalent to the command:
cat start - middle /dev/null end > file
because the entire contents of the file would be consumed by cat the first time `-' was used as a file operand and an end-of-file condition
would be detected immediately when `-' was referenced the second time.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of cat: LANG, LC_ALL, LC_CTYPE, LC_MES-
SAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 All input files were output successfully.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|CSI |enabled |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO
touch(1), attributes(5), environ(5), largefile(5), standards(5)
NOTES
Redirecting the output of cat onto one of the files being read will cause the loss of the data originally in the file being read. For exam-
ple,
example% cat filename1 filename2 >filename1
causes the original data in filename1 to be lost.
SunOS 5.10 1 Feb 1995 cat(1)