If the files are pure 7-bit ASCII, you can replace the NUL with an extended character. Just make sure you don't pick one which already exists in the file. And make sure you don't use its UTF8 representation, which is by definition multiple bytes.
Or if you can find a 7-bit printable character which doesn't occur in the file. try that. (Tab? Tilde? Underscore? @?)
... assuming your tr understands backslashed octal.
Grepping for special characters can be tricky, too; presumably, your grep will also treat NUL as end of string. Try replacing all occurrences of your character and comparing the result against the original; if they are binary identical, you have found a character which doesn't occur in the file.
... assuming your cmp accepts - to mean standard input.
I just had a filesystem / file corruption issue on my HSP's server due to disk capacity limits and fileswapping. I discovered that certain files got corrupted when fileswapping was not successful and they ended up with a string of control characters, or what I believe to be nulls, in them.
Does... (4 Replies)
Hi ,
I have faced a strange situation in Solaris.
the command ps -eo pid,args | grep 'SOMEPROCESS' truncates the output.
outpt looks like
111 xxxxxxxxxxxxx SOMEPROCES
123 xxxxxxxxxxxxx SOMEPROCES
323 xxxxxxxxxxxxx SOMEPROCES
The above doesn't return the complete command/args, infact if... (1 Reply)
Hi,
Output of running berkeley ps is truncated to 80 chars when using redirections.
$ /usr/ucb/ps -e 12490|cat #truncated to 80 chars
PID TT S TIME COMMAND
12490 pts/24 S 0:00 sleep 4000 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
getting longer lines is done by changing the stty
$... (7 Replies)
infile:
z y x
c b a
desired output:
x y z
a b c
I don't want to sort the lines into this:
a b c
x y z
nor this:
c b a
z y x
The number of fields per line and number of lines is indeterminate. The field separator is always a space.
Thanks for the use of your collective brains.... (11 Replies)
I'm relatively new to Pro*C programming. In the following example:
char name; EXEC SQL SELECT 'John Doe' INTO :name FROM DUAL;
"John Doe" is in positions 0-7, blanks in 8-19, and a null in 20. I would really prefer the null to be in position 8 and I don't care what's after that. I wrote a... (1 Reply)
Hello,
I am checking the length of each line of a fixed length file and making sure all lines are 161 length. My problem is that some files contain null characters which gets stripped out of my echo. How do I have the NULLs included in my check? (and I cannot replace or sub the NULL values with... (10 Replies)
Hello,
I am looking to automate a task - which is updating an existing access control instruction of a server and making sure that the attributes defined in the instruction is in sorted order. The instructions will be of a specific syntax.
For example lets assume below listed is one of an... (6 Replies)
Hi,
I've a PIPE delimited file with about 5 fields. Sometimes the records in the 4th field is null, so I want to replace it based on values we get it on 2nd field in the same file.
Following is an example.
ABCD|X-TYPE 3.0|2010|X-TYPE|20000
CDEF|C-TYPE 2.5|2011|C-TYPE|10000
XYZ|LX... (4 Replies)
I have a script on a Linux machine that connects remotely, via telnet on a windows machine to launch several commands and colect their output. On the Linux machine the output of these commands is redirected in a file.
The script:
#!/usr/bin/expect
log_user 0
spawn telnet 10.10.10.10... (6 Replies)
Discussion started by: black_fender
6 Replies
LEARN ABOUT OSX
vis
VIS(3) BSD Library Functions Manual VIS(3)NAME
vis -- visually encode characters
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <vis.h>
char *
vis(char *dst, int c, int flag, int nextc);
int
strvis(char *dst, const char *src, int flag);
int
strvisx(char *dst, const char *src, size_t len, int flag);
DESCRIPTION
The vis() function copies into dst a string which represents the character c. If c needs no encoding, it is copied in unaltered. The string
is null terminated, and a pointer to the end of the string is returned. The maximum length of any encoding is four characters (not including
the trailing NUL); thus, when encoding a set of characters into a buffer, the size of the buffer should be four times the number of charac-
ters encoded, plus one for the trailing NUL. The flag argument is used for altering the default range of characters considered for encoding
and for altering the visual representation. The additional character, nextc, is only used when selecting the VIS_CSTYLE encoding format
(explained below).
The strvis() and strvisx() functions copy into dst a visual representation of the string src. The strvis() function encodes characters from
src up to the first NUL. The strvisx() function encodes exactly len characters from src (this is useful for encoding a block of data that
may contain NUL's). Both forms NUL terminate dst. The size of dst must be four times the number of characters encoded from src (plus one
for the NUL). Both forms return the number of characters in dst (not including the trailing NUL).
The encoding is a unique, invertible representation composed entirely of graphic characters; it can be decoded back into the original form
using the unvis(3) or strunvis(3) functions.
There are two parameters that can be controlled: the range of characters that are encoded, and the type of representation used. By default,
all non-graphic characters except space, tab, and newline are encoded. (See isgraph(3).) The following flags alter this:
VIS_GLOB Also encode magic characters ('*', '?', '[' and '#') recognized by glob(3).
VIS_SP Also encode space.
VIS_TAB Also encode tab.
VIS_NL Also encode newline.
VIS_WHITE Synonym for VIS_SP | VIS_TAB | VIS_NL.
VIS_SAFE Only encode "unsafe" characters. Unsafe means control characters which may cause common terminals to perform unexpected func-
tions. Currently this form allows space, tab, newline, backspace, bell, and return - in addition to all graphic characters -
unencoded.
There are four forms of encoding. Most forms use the backslash character '' to introduce a special sequence; two backslashes are used to
represent a real backslash. These are the visual formats:
(default) Use an 'M' to represent meta characters (characters with the 8th bit set), and use caret '^' to represent control characters
see (iscntrl(3)). The following formats are used:
^C Represents the control character 'C'. Spans characters '