06-26-2006
10 More Discussions You Might Find Interesting
1. 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)
Discussion started by: rolex.mp
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2. Shell Programming and Scripting
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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3. UNIX for Advanced & Expert Users
hi
I have an if condition that states:
if ; then
exit
how to translate this?
$x is a path
$y is a string that comes at the end of the path
thx (11 Replies)
Discussion started by: melanie_pfefer
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4. UNIX for Dummies Questions & Answers
Hi,
I have a string variable containing value say
abc123
I want to check if the 3rd element of this string is "c"
in a if statement.Actually i dont know the syntax of how to use substring
in an if statement in shell script.
Please reply soon.
Regards
Navjot (3 Replies)
Discussion started by: navjotsingh
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5. UNIX for Dummies Questions & Answers
hi to all,
i want to check the value of a variable that it contains characters.
for example i try the following:
if then .........
i just want to check that in the specific line that is a variable called "passline" has the entry "password". But it can contain also other characters in the... (4 Replies)
Discussion started by: omonoiatis9
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6. Shell Programming and Scripting
Can someone tell me how I can do this?
e.g:
a=$(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)
Discussion started by: jforce
2 Replies
7. UNIX for Dummies Questions & Answers
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)
Discussion started by: daveu7
1 Replies
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
how can i check :
- if the content is ok (value1 / value2* )
- the two options of "value2"
when content is example "value2:22" , i want to split... (3 Replies)
Discussion started by: bora99
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9. Shell Programming and Scripting
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)
Discussion started by: sahil_shine
2 Replies
10. UNIX for Beginners Questions & Answers
Below is my ksh shell script where I need to check if variable fileprops is a subset of $1 argument.
echo "FILE PROPERTY: $fileprops"
echo "PARAMETER3: $1"
if ; then
echo "We are Good. $line FILE is found to be INTACT !! "
else
echo... (2 Replies)
Discussion started by: mohtashims
2 Replies
LEARN ABOUT CENTOS
stapdyn
STAPDYN(8) System Manager's Manual STAPDYN(8)
NAME
stapdyn - systemtap dyninst runtime
SYNOPSIS
stapdyn [ OPTIONS ] MODULE [ MODULE-OPTIONS ]
DESCRIPTION
The stapdyn program is the dyninst back-end of the Systemtap tool. It expects a shared library produced by the front-end stap tool, when
run with --dyninst.
Splitting the systemtap tool into a front-end and a back-end allows a user to compile a systemtap script on a development machine that has
the debugging information (need to compile the script) and then transfer the resulting shared objevct to a production machine that doesn't
have any development tools or debugging information installed.
Please refer to stappaths(7) for the version number, or run rpm -q systemtap (fedora/red hat) apt-get -v systemtap (ubuntu)
OPTIONS
The stapdyn program supports the following options. Any other option prints a list of supported options.
-v Verbose mode.
-V Print version number and exit.
-w Suppress warnings from the script.
-c CMD Command CMD will be run and the stapdyn program will exit when CMD does. The '_stp_target' variable will contain the pid for CMD.
-x PID The '_stp_target' variable will be set to PID.
-o FILE
Send output to FILE. If the module uses bulk mode, the output will be in percpu files FILE_x(FILE_cpux in background and bulk mode)
where 'x' is the cpu number. This supports strftime(3) formats for FILE.
-C WHEN
Control coloring of error messages. WHEN must be either "never", "always", or "auto" (i.e. enable only if at a terminal). If the op-
tion is missing, then "auto" is assumed. Colors can be modified using the SYSTEMTAP_COLORS environment variable. See the stap(1)
manual page for more information on syntax and behaviour.
var1=val
Sets the value of global variable var1 to val. Global variables contained within a script are treated as options and can be set from
the stapdyn command line.
ARGUMENTS
MODULE is either a module path or a module name. If it is a module name, the module will be looked for in the following directory (where
'VERSION' is the output of "uname -r"):
/lib/modules/VERSION/systemtap
$ stap --dyninst -p4 -m mod1 -e 'global var1="foo"; probe begin{printf("%s
", var1); exit()}'
Running this with an additional module argument:
$ stapdyn mod1.so var1="HelloWorld"
HelloWorld
Spaces and exclamation marks currently cannot be passed into global variables this way.
EXAMPLES
See the stapex(3stap) manual page for a collection of sample scripts.
Here is a very basic example of how to use stapdyn. First, use stap to compile a script. The stap program will report the pathname to the
resulting module.
$ stap --dyninst -p4 -e 'probe begin { printf("Hello World!
"); exit() }'
/home/user/.systemtap/cache/85/stap_8553d83f78c_265.so
Run stapdyn with the pathname to the module as an argument.
$ stapdyn /home/user/.systemtap/cache/85/stap_8553d83f78c_265.so
Hello World!
SAFETY AND SECURITY
Systemtap, in DynInst mode, is a developer tool, and runs completely unprivileged. The Linux kernel will only permit one's own processes
to be accessed, which is enforced by the ptrace(2) system call. See the stap(1) manual page for additional information on safety and secu-
rity.
SEE ALSO
stap(1), stapprobes(3stap), stap-server(8), staprun(8), stapex(3stap)
BUGS
Use the Bugzilla link of the project web page or our mailing list. http://sourceware.org/systemtap/, <systemtap@sourceware.org>.
STAPDYN(8)