03-30-2011
cat: write error: Connection reset by peer
I have created a script to cat the contents of a log file and pipe it to head and tail so I can get specific lines.
When I do this I sometimes randomly get the error
"cat: write error: Connection reset by peer". It is completely sporatic and sometimes it doesnt happen and sometimes it does but it means therefore the output of the script is unreliable.
Here is the code I am using where tmpfile is the name of the file im cat'ing and errorstartline is the line number in the file I want to load into the "line" variable.
line=`cat $TMPFILE | head -$ERRORSTARTLINE | tail -1`
I initially thought this was because the TMPFILE was on another mount so I added some code to cp the file to the same dir as the script and then cat but it made no difference.
Has anyone seen this error or can anyone recommend an alternative way of getting a specified line out of the log file. The log file isnt that large I dont think so not sure why I am seeing this issue.
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CAT(1) General Commands Manual CAT(1)
NAME
cat - catenate and print
SYNOPSIS
cat [ -u ] [ -n ] [ -s ] [ -v ] file ...
DESCRIPTION
Cat reads each file in sequence and displays it on the standard output. Thus
cat file
displays the file on the standard output, and
cat file1 file2 >file3
concatenates the first two files and places the result on the third.
If no input file is given, or if the argument `-' is encountered, cat reads from the standard input file. Output is buffered in the block
size recommended by stat(2) unless the standard output is a terminal, when it is line buffered. The -u option makes the output completely
unbuffered.
The -n option displays the output lines preceded by lines numbers, numbered sequentially from 1. Specifying the -b option with the -n
option omits the line numbers from blank lines.
The -s option crushes out multiple adjacent empty lines so that the output is displayed single spaced.
The -v option displays non-printing characters so that they are visible. Control characters print like ^X for control-x; the delete char-
acter (octal 0177) prints as ^?. Non-ascii characters (with the high bit set) are printed as M- (for meta) followed by the character of
the low 7 bits. A -e option may be given with the -v option, which displays a `$' character at the end of each line. Specifying the -t
option with the -v option displays tab characters as ^I.
SEE ALSO
cp(1), ex(1), more(1), pr(1), tail(1)
BUGS
Beware of `cat a b >a' and `cat a b >b', which destroy the input files before reading them.
4th Berkeley Distribution May 5, 1986 CAT(1)