I'm not sure if bash can handle null bytes (usually they don't belong to text files).
As a quick fix I would use another tool for parsing files containing null bytes.
By the way, some shells (I tried with zsh and pdksh using read -r) seem to handle it.
I have checked it here (Solaris) and -r does not make a trick.
Quote:
Originally Posted by joeyg
Can you use the tr command to trim out those characters?
Yes, I can, but it is as 'hands up' on problem
By now I do it in perl, and that is pretty useful way, but I'd like to now how to be in such situation.
What I do not like in the 'tr' - need to create another file. Also, the removing (-d) is not useful as I need to read positioned fields, but replacing with spaces works.
I am not sure: that way with the 'cat ..', it is, again, done on whole file, isn't it?
(And, it seems to me, there is some glitch in bash-2.05 in processing pipe by while (something about that I've experiensed about half year ago.) Seems something with asigning variables...
So, another point why I do not like that solution by 'tr..'
STEP 1
# Set variable
FILE=/tmp/mainfile
SEARCHFILE =/tmp/searchfile
# THIS IS THE MAIN FILE.
cat /tmp/mainfile
Interface Ethernet0/0 "outside", is up, line protocol is up
Hardware is i82546GB rev03, BW 100 Mbps
Full-Duplex(Full-duplex), 100 Mbps(100 Mbps)
MAC address... (6 Replies)
Hi ,
I am trying to write an shell, which reads a text file (from a location) having a list of numbers of strictly 5 digits only ex: 33144
Now my script will check :
1) that each entry is only 5 digits & numeric only, no alphabets, & its not empty.
2)then it executes a shell script called... (8 Replies)
Hi All,
I'm trying to figure out which are the trusted-ips and which are not using a script file.. I have a file named 'ip-list.txt' which contains some ip addresses and another file named 'trusted-ip-list.txt' which also contains some ip addresses. I want to read a line from... (4 Replies)
hello all
I'm writing a bash script and I need to read data from a file line by line
The number of words of each line is not known and I want to check if anywhere
in the line exists the substring www..That substring is a string by itself
or a substring of other strings.So what I tried so far... (4 Replies)
Hello,
I need a program that read a file line by line and prints out lines 1, 2 & 3 after an empty line... An example of entries in the file would be:
SRVXPAPI001 ERRO JUN24 07:28:34 1775
REASON= 0000, PROCID= #E506 #1065: TPCIPPR, INDEX= 003F
... (8 Replies)
Hi All,
Am trying to write wrapper shell/bash script on a utility tool for which i need to pass 2 files as arugment to execute utility tool.
Wraper script am trying is to do with above metion 2 files.
utility tool accepts :
a. userinfo file : which contains username
b. item file : which... (2 Replies)
Hi all,
I have a log file say Test.log that gets updated continuously and it has data in pipe separated format. A sample log file would look like:
<date1>|<data1>|<url1>|<result1>
<date2>|<data2>|<url2>|<result2>
<date3>|<data3>|<url3>|<result3>
<date4>|<data4>|<url4>|<result4>
What I... (3 Replies)
Heyas
I'm trying to read/display a file its content and put borders around it (tui-cat / tui-cat -t(ypwriter).
The typewriter-part is a 'bonus' but still has its own flaws, but thats for later.
So in some way, i'm trying to rewrite cat using bash and other commands.
But sadly it fails on... (2 Replies)
Hello,
I'm works on Ubuntu server
My goal : I would like to read file line per line, but i want to started at the end of file.
Currently, I use instructions :
while read line;
do
COMMAND
done < /var/log/apache2/access.log
But, the first line, i don't want this. The file is long... (5 Replies)
I have a file
file_name_O.txt
The file can have different number of other files names or nothing
I will check
cnt=`wc -l file_name_0.txt`
if ;then
exit 1
fi
Now I have to start checking file names, i.e. read txt file line by line. If amount of ,lines equal 1, I can... (4 Replies)
Discussion started by: digioleg54
4 Replies
LEARN ABOUT DEBIAN
flow-cat
flow-cat(1) General Commands Manual flow-cat(1)NAME
flow-cat -- Concatenate flow files
SYNOPSIS
flow-cat [-aghmp] [-b big|little] [-C comment] [-d debug_level] [-o filename] [-t start_time] [-T start_time] [-z z_level]
[file|directory ...]
DESCRIPTION
The flow-cat utility processes files and/or directories of files in the flow-tools format. The resulting concatenated data set is written
to the standard output or file specified by -o. If file is a single dash (`-') or absent, flow-cat will read from the standard input.
OPTIONS -a Do not ignore filenames that begin with tmp.
-b big|little
Byte order of output.
-C Comment
Add a comment.
-d debug_level
Enable debugging.
-g Sort file list by capture start time before processing.
-h Display help.
-m Disable the use of mmap().
-p Preload headers. Use to preserve meta information such as lost flows.
-o file Write to file instead of the standard out.
-t start_time
Select flow files up to start_time. If used with -T select files between start_time and end_time.
-T end_time
Select flow files after end_time. If used with -t select files between start_time and end_time.
-z z_level
Configure compression level to z_level. 0 is disabled (no compression), 9 is highest compression.
file|directory...
Process the files and/or directory.
TIME /DATE parsing
start_time and end_time parsing is implemented with getdate.y, a commonly used function to process free-form time date specifications.
Example usage borrowed from cvs:
1 month ago
2 hours ago
400000 seconds ago
last year
last Monday
yesterday
a fortnight ago
3/31/92 10:00:07 PST
January 23, 1987 10:05pm
22:00 GMT
EXAMPLES
Concatenate all flow files begining with ft-v05.2001-05.01, use flow-print to display the results.
flow-cat ft-v05.2001-05-01.* | flow-print
Concatenate flow files in /flows/krc4, store store the output in compressed.flows at compression level 9 (best). The headers are preloaded
so various metadata such as the flow count is correct in the result. Filenames begining with tmp which are typically in-progress flow
files from flow-capture are not processed.
flow-cat -p -z9 /flows/krc4 > compressed.flows
BUGS
None known.
AUTHOR
Mark Fullmer maf@splintered.net
SEE ALSO flow-tools(1)flow-cat(1)