10-16-2014
It is a really bad idea. It is extremely insecure, dangerous, error-prone(not just malfunctioning but syntax errors out of the blue given unexpected input), difficult to pass values into and out of, and incomprehensible to anyone who didn't write it (and often enough, to the writer, eventually).
Wanting to do so usually means more ordinary methods like functions, variables, and loops have been overlooked.
What exactly is your goal here? What problem are you trying to solve by storing commands?
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi all..
I got a problem..
Its easy to redirect o/p to a file.. But Is it possible to redirect the O/P to a variable?
For example:
I've a command in my script:
string1=cut -d ':' -f2 file.txt
When I do:
echo $string1
The value is empty... Pls suggest me how to store the value... (7 Replies)
Discussion started by: smartbuddy
7 Replies
2. Shell Programming and Scripting
I have a variable A
echo $A
5060
I am exporting the value X,Y,Z and it id fetching right thing and When I run
C=`${X} -l ${Y} ${Z} "trap '' INT;. ~/.profile >/dev/null 2>/dev/null; netstat -na | grep \$A`"
here it is going to same directory and also running netstat -na | grep 5060
... (4 Replies)
Discussion started by: madhusmita
4 Replies
3. Shell Programming and Scripting
Hi Jim,
The following script is in working state. But i m having one more problem with awk cmd. Could you tell me how to use any variable inside awk or how to take any variable value outside awk.
My problem is i want to maintain one property file in which i am declaring variable value into that... (12 Replies)
Discussion started by: Ganesh Khandare
12 Replies
4. Shell Programming and Scripting
I am sure it has been answered in some form or the other in this forum but trust me I have spent last couple of hours looking for an answer but can't find it.
I want to do a very simple operation within my script.
Let's say I have 4 files with the names file1.log, file2.log, file3.log and... (6 Replies)
Discussion started by: sssccc
6 Replies
5. Shell Programming and Scripting
Hi,
I am trying to do the following thing
var='date'
$var
Above command substitutes date for and in turn runs the date command and i am getting the todays date value.
I am trying to do the same thing as following, but facing some problems,
unique_host_pro="sed -e ' /#/d'... (3 Replies)
Discussion started by: gvinayagam
3 Replies
6. Shell Programming and Scripting
Hello Experts
I am newbie to unix and writing one script to make archive files
Problme i am facing is : I have used find command to find the type of files and I am storing find command results in a variable.
When I echo the variable I can see that path is printed properly but when i am... (5 Replies)
Discussion started by: mitsyjohn
5 Replies
7. Shell Programming and Scripting
Hi
How to use a variable to store the filename of a file which was found by the 'find' command.
can this be practical-->var = find . -name "filename.dat"
Please help.. (1 Reply)
Discussion started by: ayyappaas
1 Replies
8. Shell Programming and Scripting
Hello All
My req is to store the exit status of a command in shell variable
I want to check whether the file has header or not
The header will contain the string
DATA_ACQ_CYC_CNTL_ID
So I am running the command
head -1 $i | grep DATA_ACQ_CYC_CNTL_ID
Now I have to check if... (6 Replies)
Discussion started by: Pratik4891
6 Replies
9. Shell Programming and Scripting
I want to store the return value of
grep -c string filename
into a variable, say count. How do I do that?
For example if grep -c "string" "filename" shows 0 on executing it in the sh shell then I want to store this 0 in a variable. Is it possible? :D (5 Replies)
Discussion started by: navienavnav
5 Replies
10. Programming
I am trying to store output of python command in variable. Could you please help how I can do that ?
For example I am executing the following command - "CentOS" in server_desc
The output would be True or False
I would like to store the output in a variable say outPut and use condition... (4 Replies)
Discussion started by: atanubanerji
4 Replies
LEARN ABOUT CENTOS
error::pass1
ERROR::PASS1(7stap) ERROR::PASS1(7stap)
NAME
error::pass1 - systemtap pass-1 errors
DESCRIPTION
Errors that occur during pass 1 (parsing) usually mean a basic syntax error of some sort occurred in the systemtap script. There are sev-
eral classes of problems possible:
plain syntax error
The systemtap script parser detects a large variety of errors, such as missing operands, bad punctuation. It tries to list what
kinds of tokens it was expecting to see, and will show the region of the source code with the problem. Please review the stap(1)
man page and/or the tutorial, to correct the script's syntax.
grammar ambiguities
There is at least one known ambiguity in the systemtap grammar. It relates to the optionality of ; (semicolon) separators between
statements, and the ++ and -- increment/decrement operators. If the parser indicates an error, consider adding some explicit ; sep-
arators between nearby statements and try again.
missing command line arguments
A systemtap script that uses the $N and @N constructs for substituting in command-line options may fail if not enough options were
given on the stap command line.
compatibility changes
Some versions of systemtap have changed the language incompatibly, for example by adding the try/catch keywords for exception han-
dling. In such cases, rerun systemtap with the --compatibility=VERSION option, substituting the last systemtap version where your
script was known to work. You may also check the release-history NEWS file for compatibility changes.
GATHERING MORE INFORMATION
Increasing the verbosity of pass-1 with an option such as --vp 1 can help pinpoint the problem.
SEE ALSO
stap(1),
error::reporting(7stap)
ERROR::PASS1(7stap)