find/xargs/*grep: find multi-line empty "try-catch" blocks - eg, missing ; not in a commented block
How can I recursively find all files in a directory and print out the file and first line number of any text blocks that match the below cases?
This would seem to involve find, xargs, *grep, regex, etc.
In summary, I want to find so-called empty "try-catch blocks" that do not contain code inside them (do not contain a semicolon ';')
Below are the most simple to the most sophisticated cases I'd like to find.
Code:
// MOST SIMPLE - find catch(...) { //just white-spaces over possibly multiple lines }
try(...)
catch( match this catch block because there is nothing but white-spaces between the below '{' and '})
{
}
// BETTER - find missing ';'
try(...)
catch()
{
match this because there is no semi-colon between the braces
}
try(...)
catch(...)
{
do not match this, because it does contain a semi-colon here;
}
try(...)
catch(match this)
{
}
// BEST - consider comment-blocks
try(...)
catch(...)
{
<!--- the <!--- and ---> are coldfusion tags that indicate a comment block.
As such, we should match this line that *does* contain a ; because this ; is not actually part of any in-use code --->
}
Moderator's Comments:
please use code tags
Last edited by jim mcnamara; 03-12-2012 at 11:09 AM..
Hi Friends,
Can any of you explain me about the below line of code?
mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`
Im not able to understand, what exactly it is doing :confused:
Any help would be useful for me.
Lokesha (4 Replies)
Hi
I'm trying to remove empty sub-folders from 1 main folder using the find method, but the "- empty" parameter isn't recognized by my Unix version.
Any idea how to implement such thing?
Thanks. (3 Replies)
Dear friends,
please tell me how to find the files which are existing in the current directory, but it sholud not search in the sub directories..
it is like this,
current directory contains
file1, file2, file3, dir1, dir2
and dir1 conatins
file4, file5
and dir2 contains
file6,... (9 Replies)
Hi all,
I am a unix noob. Need some basic help. I have tried using google, but not able to figure this out.
Here are the scenarios:
1. How do I find a directory with a particular name, say "Merlin" in the entire file system? I tried :
find / -type d -name "dir_name"
The problem is I'm... (3 Replies)
I want to list all files/lines which except those which contain the pattern ' /proc/' OR ' /sys/' (mind the leading blank).
In a first approach I coded:
find / -exec ls -ld {} | grep -v ' /proc/| /sys/' \; > /tmp/list.txt
But this doesn't work. I got an error (under Ubuntu):
grep:... (5 Replies)
Hi,
What is the difference between the following commands
find . -type f -exec grep 'abc' {} \;
and
find . -type f | xargs grep 'abc'
Appreciate your help. (2 Replies)
I have a bunch of random character lines like ABCEDFG. I want to find all lines with "A" and then change any "E" to "X" in the same line. ALL lines with "A" will have an "X" somewhere in it. I have tried sed awk and vi editor. I get close, not quite there. I know someone has already solved this... (10 Replies)
I am trying find files in sub dir with certain tags using tag command, and add the period to the beginning. I can't use chflags hidden {} cause it doesn't add period to the beginning of the string for web purpose. So far with my knowledge, I only know mdfind or tag can be used to search files with... (6 Replies)
Discussion started by: Nexeu
6 Replies
LEARN ABOUT REDHAT
catch
catch(n) Tcl Built-In Commands catch(n)
__________________________________________________________________________________________________________________________________________________NAME
catch - Evaluate script and trap exceptional returns
SYNOPSIS
catch script ?varName?
_________________________________________________________________DESCRIPTION
The catch command may be used to prevent errors from aborting command interpretation. Catch calls the Tcl interpreter recursively to exe-
cute script, and always returns without raising an error, regardless of any errors that might occur while executing script.
If script raises an error, catch will return a non-zero integer value corresponding to one of the exceptional return codes (see tcl.h for
the definitions of code values). If the varName argument is given, then the variable it names is set to the error message from interpret-
ing script.
If script does not raise an error, catch will return 0 (TCL_OK) and set the variable to the value returned from script.
Note that catch catches all exceptions, including those generated by break and continue as well as errors. The only errors that are not
caught are syntax errors found when the script is compiled. This is because the catch command only catches errors during runtime. When
the catch statement is compiled, the script is compiled as well and any syntax errors will generate a Tcl error.
EXAMPLES
The catch command may be used in an if to branch based on the success of a script.
if { [catch {open $someFile w} fid] } {
puts stderr "Could not open $someFile for writing
$fid"
exit 1
}
The catch command will not catch compiled syntax errors. The first time proc foo is called, the body will be compiled and a Tcl error will
be generated.
proc foo {} {
catch {expr {1 +- }}
}
KEYWORDS
catch, error
Tcl 8.0 catch(n)
03-12-2012
