Nice approach indeed!
Could be curtailed to
, including the item list file as well.
I went with this method inserted into a script. It worked well (and very quickly) the first time I tried it, but there was no output the second time. I will have to investigate what I did there.
I also made a second try before there were any responses here. This ended up looking more like the code posted by MadeInGermany where I read in the file to be modified and stored it in an array. I then did a double loop with the outside loop being my list file and the inside loop being the array with the file to be modified. Each item in the list was searched against the lines in the array. If a match was found, the array element was modified to remove the comment and then there was a break in the inner loop. The modified array was printed at the end. This approach means that each file is read in once and the output was written once, instead of once for each list item.
It seems to me that sed must be doing more or less the same thing under the hood. Every list item must be checked against every item in the file to be modified, at least until a match is found. I wasn't able to rationalize if it was more efficient to have one or the other file be the inner loop. The only approach I could think of that would be faster would be to identify the 'Gmax" value on each line of the file to be modified and then loop up that value in a map holding the list. That would, however, involve much more significant parsing of the lines to extract the 'Gmax' value. It is very nice to have a glob match, especially when there isn't a clear and consistent delimiter. If the list was the inner loop, you could delete each array element when a match was found and thus shorten the search as the process continues but deleting and shifting around array elements also takes resources.
Does anyone know what sed is doing to achieve the result so quickly? Is it mainly that is is using compiled code?
I have a dropdown menu built in perl tk (I am using active state perl). I want to select a value from the dropdown menu and I want to be able to perform some other actions depending upon what value is selected. I have all the graphical part made but I dont know how to get the selected value. Any... (0 Replies)
Requirement is:
1. comment and uncomment the line with Shell
Script: /opt/admin/fastpg/bin/fastpg.exe -c -=NET (using fastpg.exe as a search option)
2. display = "Commented" (when its commented) and display = "Uncommented" (when its uncommented)
Its urgent, please let me asap!!!
Thanks in... (2 Replies)
Hi,
I've a list in the following format:
Empdept filedetails buildingNo Area
AAA 444 2 juy
AAA 544 2 kui
AAA 567 4 poi
AAA 734 5 oiu
AAA 444 ... (2 Replies)
I have a combo.cgi here. this is linux environment
What i am going to do is this combobox will list down all the flatfile name in this /u/test/cgi-bin/List directory.
after that, i wanted it to open the flatfile and display the content of the flatfile into another listbox or textarea in this page... (0 Replies)
Hi,
I have the following lines that I would like to see in an array for easy comparisons and printing:
Example 1:
field1,field2,field3,field4,field5
value1,value2,value3,value4,value5Example 2:
field1,field3,field4,field2,field5,field6,field7... (7 Replies)
Hi All,
Need a small help in writing a shell script which can delete a few lines from a file which is currently being used by another process.
File gets appended using tee -a command due to which its size is getting increased.
Contents like :
25/09/2012 05:18 Run ID:56579677-1
My... (3 Replies)
cd path
line1
line2
line3
line4
line5
Lets say thats the sample script...So say if i have to comment the above script, which would be the better way so that whenever i want, i cud comment or uncomment the same.
Thanks (1 Reply)
I have one master file "File1" with all such info in it. I need to grep each object under each list from another file "File2". Can anyone help me with a script for this.
File 1
------
List 1
Object 1
Object 2
List 2
Object 3
Object 1
List 3
Object 2
... (5 Replies)
Hello,
I have some tab delimited text data,
file: final_temp1
aname val
NAME;r'(1,) 3.28584
r'(2,)<tab>
NAME;r'(3,) 6.13003
NAME;r'(4,) 4.18037
r'(5,)<tab>
You can see that the data is incomplete in some cases. There is a trailing tab after the first column for each incomplete row. I... (2 Replies)
Hello,
I need to collect some statistical results from a series of files that are being generated by other software. The files are tab delimited. There are 4 different sets of statistics in each file where there is a line indicating what the statistic set is, followed by 5 lines of values. It... (8 Replies)
Discussion started by: LMHmedchem
8 Replies
LEARN ABOUT REDHAT
array
array(n) Tcl Built-In Commands array(n)
__________________________________________________________________________________________________________________________________________________NAME
array - Manipulate array variables
SYNOPSIS
array option arrayName ?arg arg ...?
_________________________________________________________________DESCRIPTION
This command performs one of several operations on the variable given by arrayName. Unless otherwise specified for individual commands
below, arrayName must be the name of an existing array variable. The option argument determines what action is carried out by the command.
The legal options (which may be abbreviated) are:
array anymore arrayName searchId
Returns 1 if there are any more elements left to be processed in an array search, 0 if all elements have already been returned.
SearchId indicates which search on arrayName to check, and must have been the return value from a previous invocation of array
startsearch. This option is particularly useful if an array has an element with an empty name, since the return value from array
nextelement won't indicate whether the search has been completed.
array donesearch arrayName searchId
This command terminates an array search and destroys all the state associated with that search. SearchId indicates which search on
arrayName to destroy, and must have been the return value from a previous invocation of array startsearch. Returns an empty string.
array exists arrayName
Returns 1 if arrayName is an array variable, 0 if there is no variable by that name or if it is a scalar variable.
array get arrayName ?pattern?
Returns a list containing pairs of elements. The first element in each pair is the name of an element in arrayName and the second
element of each pair is the value of the array element. The order of the pairs is undefined. If pattern is not specified, then all
of the elements of the array are included in the result. If pattern is specified, then only those elements whose names match pat-
tern (using the matching rules of string match) are included. If arrayName isn't the name of an array variable, or if the array
contains no elements, then an empty list is returned.
array names arrayName ?pattern?
Returns a list containing the names of all of the elements in the array that match pattern (using the matching rules of string
match). If pattern is omitted then the command returns all of the element names in the array. If there are no (matching) elements
in the array, or if arrayName isn't the name of an array variable, then an empty string is returned.
array nextelement arrayName searchId
Returns the name of the next element in arrayName, or an empty string if all elements of arrayName have already been returned in
this search. The searchId argument identifies the search, and must have been the return value of an array startsearch command.
Warning: if elements are added to or deleted from the array, then all searches are automatically terminated just as if array done-
search had been invoked; this will cause array nextelement operations to fail for those searches.
array set arrayName list
Sets the values of one or more elements in arrayName. list must have a form like that returned by array get, consisting of an even
number of elements. Each odd-numbered element in list is treated as an element name within arrayName, and the following element in
list is used as a new value for that array element. If the variable arrayName does not already exist and list is empty, arrayName
is created with an empty array value.
array size arrayName
Returns a decimal string giving the number of elements in the array. If arrayName isn't the name of an array then 0 is returned.
array startsearch arrayName
This command initializes an element-by-element search through the array given by arrayName, such that invocations of the array nex-
telement command will return the names of the individual elements in the array. When the search has been completed, the array done-
search command should be invoked. The return value is a search identifier that must be used in array nextelement and array done-
search commands; it allows multiple searches to be underway simultaneously for the same array. |
array unset arrayName ?pattern? |
Unsets all of the elements in the array that match pattern (using the matching rules of string match). If arrayName isn't the name |
of an array variable or there are no matching elements in the array, then an empty string is returned. If pattern is omitted and is |
it an array variable, then the command unsets the entire array.
KEYWORDS
array, element names, search
Tcl 8.3 array(n)