02-02-2010
Just use it with or without exclamation mark. It's just a negation.
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1. Shell Programming and Scripting
hi,
I have a variable var1 as follows in the script.
var1="one two three desformat=PDF xyz"
I would like to check whether $var1 has a string "desformat=PDF" or not.
Is there any command I can use (not need to creat a file)?
Currently, I am using this:
if ( grep "desformat=PDF"... (1 Reply)
Discussion started by: josephwong
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2. UNIX for Dummies Questions & Answers
I am passing an argument to a file and i wanna check whether the argument is a number or string ?
how can i do this? (4 Replies)
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Hello All,
Plz help me with:
I have a csv file with data separated by ',' and optionally enclosed by "". I want to check each of these values to see if they exceed the specified string length, and if they do I want to cut just that value to the max length allowed and keep the csv format as it... (9 Replies)
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hi
I have an if condition that states:
if ; then
exit
how to translate this?
$x is a path
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5. UNIX for Dummies Questions & Answers
Hi,
I have a string variable containing value say
abc123
I want to check if the 3rd element of this string is "c"
in a if statement.Actually i dont know the syntax of how to use substring
in an if statement in shell script.
Please reply soon.
Regards
Navjot (3 Replies)
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6. Shell Programming and Scripting
Can someone tell me how I can do this?
e.g:
a=$(echo -e wert trewt ertert ertert ertert erttert
erterte
rterter
tertertert
ert)
How do i replace the STRING with $a?
I try this:
sed -i 's/STRING/'"$a"'/g' filename.ext
but this don' t work (2 Replies)
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Hi All,
I am trying to to compare a string variable with a string literal inside a loop but keep getting the
./testifstructure.sh: line 6:
#!/bin/sh
BOOK_LIST="BOOK1 BOOK2"
for BOOK in ${BOOK_LIST}
do
if
then echo '1'
else
echo '2'
fi
done
Please use next... (1 Reply)
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8. Shell Programming and Scripting
hello,
i have a variable which should have following content :
var="value1"
or
var="value2"
or
var="value2:*" # example: value2:22
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- the two options of "value2"
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I want to append file with a string but before doing that i want to check if this string already exist in that file.I tried with grep on Solaris 10 but unsuccessful.Man pages from grep seems to suggest if the string is found command status will be 0 and if not 1.But i am not finding it.May be i... (2 Replies)
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Below is my ksh shell script where I need to check if variable fileprops is a subset of $1 argument.
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LEARN ABOUT SUNOS
sockatmark
sockatmark(3XNET) X/Open Networking Services Library Functions sockatmark(3XNET)
NAME
sockatmark - determine whether a socket is at the out-of-band mark
SYNOPSIS
cc [ flag ... ] file ... -lxnet [ library ... ]
#include <sys/socket.h>
int sockatmark(int s);
DESCRIPTION
The sockatmark() function determines whether the socket specified by the descriptor s is at the out-of-band data mark. If the protocol for
the socket supports out-of-band data by marking the stream with an out-of-band data mark, the sockatmark() function returns 1 when all data
preceding the mark has been read and the out-of-band data mark is the first element in the receive queue. The sockatmark() function does
not remove the mark from the stream.
RETURN VALUES
Upon successful completion, the sockatmark() function returns a value indicating whether the socket is at an out-of-band data mark. If the
protocol has marked the data stream and all data preceding the mark has been read, the return value is 1. If there is no mark, or if data
precedes the mark in the receive queue, the sockatmark() function returns 0. Otherwise, it returns -1 and sets errno to indicate the error.
ERRORS
The sockatmark() function will fail if:
EBADF The s argument is not a valid file descriptor.
ENOTTY The s argument does not specify a descriptor for a socket.
USAGE
The use of this function between receive operations allows an application to determine which received data precedes the out-of-band data
and which follows the out-of-band data.
There is an inherent race condition in the use of this function. On an empty receive queue, the current read of the location might well be
at the "mark", but the system has no way of knowing that the next data segment that will arrive from the network will carry the mark, and
sockatmark() will return false, and the next read operation will silently consume the mark.
Hence, this function can only be used reliably when the application already knows that the out-of-band data has been seen by the system or
that it is known that there is data waiting to be read at the socket, either by SIGURG or select(3C).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |Safe |
+-----------------------------+-----------------------------+
SEE ALSO
recv(3XNET), recvmsg(3XNET), select(3C), attributes(5), standards(5)
SunOS 5.10 1 Oct 2003 sockatmark(3XNET)