06-13-2013
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1. Shell Programming and Scripting
How can i read all the unique words in a file, i used -
cat comment_file.txt | /usr/xpg6/bin/tr -sc 'A-Za-z' '/012'
and
cat comment_file.txt | /usr/xpg6/bin/tr -sdc 'A-Za-z' '/012'
but they didnt worked..... (5 Replies)
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2. Programming
needa c program to extract text between two delimiters from some text file.
and then storing them in to diffrent variables ?
text file like 0:
abc.txt
=========
aaaaaa|11111111|sssssssssss|333333|ddddddddd|34343454564|asass
aaaaaa|11111111|sssssssssss|333333|ddddddddd|34343454564|asass... (7 Replies)
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Hi Guys,
While I was writing one shell script , I just got struck at this point.
I need to extract words from a file at some specified position and do some comparison operation and need to replace the extracted word with another word.
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Hi there, Unix Gurus
Working with big listings of english sentences for my pupils, of the type:
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....
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Hi Guys,
Can someone help me with a way to extract text between two words on a single line.
For example if the file has below content I want to extract all text between b and f inclusive of b and f. Aparently sed does this but does it line by line and I guess it cannot read word by word.
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i need to extract the string between two tags,
input file is
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7. Shell Programming and Scripting
I have a long list of alphanumberic words (no spaces or characters) in file1.txt I need to check for the existance of each of the words from file1.txt against file2.txt and if the word is NOT in file2.txt, I need to know about it, either standard output or redirect to file3.txt
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Hello,
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9. Shell Programming and Scripting
Hi Guys..
I have a file and i want to extract all words that starts with a pattern 'ABC_' or 'ADF_'
For example,
ABC.txt
----
INSERT INTO ABC_DLKFJAL_FJKLD
SELECT DISTINCT S,B,C FROM ADF_DKF_KDFJ_IERU8 A, ABC_LKDJFREUE9_FJKDF B
WHERE A.FI=B.EI;
COMMIT;
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hi I made this simple script to extract data and pretty much is a list and would like to extract data of two words separated by commas and I would like to make a new text file that would list these extracted data into a list and each in a new line.
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catch(n) Tcl Built-In Commands catch(n)
__________________________________________________________________________________________________________________________________________________
NAME
catch - Evaluate script and trap exceptional returns
SYNOPSIS
catch script ?resultVarName? ?optionsVarName?
_________________________________________________________________
DESCRIPTION
The catch command may be used to prevent errors from aborting command interpretation. The catch command calls the Tcl interpreter recur-
sively to execute 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 the exceptional return code returned by evaluation
of script. Tcl defines the normal return code from script evaluation to be zero (0), or TCL_OK. Tcl also defines four exceptional return
codes: 1 (TCL_ERROR), 2 (TCL_RETURN), 3 (TCL_BREAK), and 4 (TCL_CONTINUE). Errors during evaluation of a script are indicated by a return
code of TCL_ERROR. The other exceptional return codes are returned by the return, break, and continue commands and in other special situa-
tions as documented. Tcl packages can define new commands that return other integer values as return codes as well, and scripts that make
use of the return -code command can also have return codes other than the five defined by Tcl.
If the resultVarName argument is given, then the variable it names is set to the result of the script evaluation. When the return code
from the script is 1 (TCL_ERROR), the value stored in resultVarName is an error message. When the return code from the script is 0
(TCL_OK), the value stored in resultVarName is the value returned from script.
If the optionsVarName argument is given, then the variable it names is set to a dictionary of return options returned by evaluation of |
script. Tcl specifies two entries that are always defined in the dictionary: -code and -level. When the return code from evaluation of |
script is not TCL_RETURN, the value of the -level entry will be 0, and the value of the -code entry will be the same as the return code. |
Only when the return code is TCL_RETURN will the values of the -level and -code entries be something else, as further described in the doc- |
umentation for the return command. |
When the return code from evaluation of script is TCL_ERROR, three additional entries are defined in the dictionary of return options |
stored in optionsVarName: -errorinfo, -errorcode, and -errorline. The value of the -errorinfo entry is a formatted stack trace containing |
more information about the context in which the error happened. The formatted stack trace is meant to be read by a person. The value of |
the -errorcode entry is additional information about the error stored as a list. The -errorcode value is meant to be further processed by |
programs, and may not be particularly readable by people. The value of the -errorline entry is an integer indicating which line of script |
was being evaluated when the error occurred. The values of the -errorinfo and -errorcode entries of the most recent error are also avail- |
able as values of the global variables ::errorInfo and ::errorCode respectively. |
Tcl packages may provide commands that set other entries in the dictionary of return options, and the return command may be used by scripts |
to set return options in addition to those defined above.
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
}
There are more complex examples of catch usage in the documentation for the return command.
SEE ALSO
break(n), continue(n), dict(n), error(n), return(n), tclvars(n)
KEYWORDS
catch, error
Tcl 8.5 catch(n)