I'm reading a text file with fscanf using a loop until feof(inFile). How can I return to the top of the file? As in I have one loop that scans until the eof and then after it there's another loop and I want to start from the beginning of the file again scanning to the end of it. How do I get back there?
View 3 RepliesI am trying to append text to the beginning of a file. This is what I have so far.
Code:
date_default_timezone_set('America/Chicago');
$date=date("m-d-Y g:i:s a");
[code]....
I have a script that reads part of a line, delimited between the first and second intended part by a colon. Then it "chops" the part after the colon, which are words offset by commas (counting them beforehand so as to catch every word in the string's second part), like this:
Code:
"COLORS.JPG:red,orange,yellow,green,"
(Returning)
red
[code]....
single script that parses/breaks both parts of a line like this "COLORS.JPG:red,orange,yellow,green;blue,indigo,violet," so that the two parts, separated into single words (or two and three words, sometimes with spaces) can be used as single-line annotations and written to JPEG files using Exiv2. So far, I haven't been able to come up with a script that does this without one part of the total string(usually that part after the colon) becoming the first word in the second array. In other words, I look for this:
KEYWORDS:
[ ]red
[ ]orange
[ ]yellow
[code]....
Or vice-versa (ie, the second array winds up as a single-line "member" of the first). I think it's because I'm using a single while read loop to read the text file in which the filenames and substrings happen to be. If there's some way of reading a file once and going back to the beginning to read it again in another while loop, I haven't found it.
How to manage the find command to return true or false if a file was found/or not? I tried to man find but didn't found anything.
View 12 Replies View RelatedWas wondering if any perl guru's could help me with a quick log file adjustment. I have a text file that looks like so (tabs and newlines are revealed so you can see what separates the data):
There are maybe 100 lines of text in this file at any given time. I need to delete all duplicate lines only looking at the first bit of text prior to the first tab. It doesn't matter which one gets deleted as long as there are no two lines that begin with that same text at the beginning before the first tab. So in this example, either the fist line "1234" or the last line "1234" would need to be deleted. I already have code in my script that opens the files - I just need the code to read the text into an array and the part that would find matches based on the above criteria, and make the deletions.
If it would be easier, I can even do a system call and use SED (v4.1.5) and/or AWK (3.1.5) instead.
I need to insert 3-4 lines of text to the beginning of a text file. The file is a largish MYSQL dump, the result of a backup shell script. This shell script should insert the required text.I've wrestled with sed, but lost.
View 2 Replies View RelatedI need to output of a script to a file with tags.
I'm trying sed and was able to put a tag on the end of the line
Code:
Output is
Quote:
What I need to have is
Quote:
I'm thinking of I redirect my first sed command to a file and then use sed again to put <group> at the beginning of the line. My problem is how to put <group> to all beginning of the string.
I try to do a function which removes '#' from beginning of line. But if there is not '#' then add it on beginning of line. I try something like this, can you correct me?
Code:
awk '
!/^#/{ sub(/^[^#]*/,"#$0","'$line'")
}
/^#/{ sub(/#/,"","'$line'")
}'
I am having some difficulties with an expect script. What I want is that as soon as expect sees a newline followed by a dollarsign ($), that interact is done. So I would expect something like this to work:
Code:
"
$" { interact }
However it doesn't.
This is debugging output:
Code:
expect: continuing expect
expect: does " " (spawn_id exp6) match glob pattern "#"? no
[Code]...
Does any one know what syntax i could use to allow me to replace all instances at the beginning of a line with ones.
Before :
Code:
----------------------------------------------------------------------
Logical device information
----------------------------------------------------------------------
Logical device number 0
Logical device name : RAID1Mirror
RAID level : 1
Status of logical device : Optimal
After
Code:
----------------------------------------------------------------------
Logical device information
----------------------------------------------------------------------
Logical device number 0
111Logical device name : RAID1Mirror
1111RAID level : 1
11111Status of logical device : Optimal
I am working with a Tcl script and have some strings in the following format (RE):
[a-zA-Z]+[0-9]{6}-[0-9]
There are some leading letters, combinations of capital and lowercase. Then six digits, followed by a hyphen, then one more digit. I would like to remove all of the leading alphabetic characters from the string. The resulting string would then be in this format: [0-9]{6}-[0-9]. In other words, six numeric digits, a hyphen, then one more digit.
I have tried:
Code:
set newstr [string trimleft $origstr alpha]
But that only removes the first alphabetic character, not all of them.
I couldn't get anything with regsub to work correctly, but I am somewhat of a noob with RE's in general and regsub in particular. There are usually 5 leading letters at the beginning of these strings, and I could in most cases get away with using string replace and constant indices to extract the substring. However, my preference is for this to be robust enough to handle all cases with 1 through n leading alphabetic characters.
I have found a file beginning with a question mark in my home dir, not sure how the hell it got there. It's from a downloaded rar i think.
Does anyone know how to do this?
Movie and translation are 32 seconds out of sync. There are 2 ways to resolve:
1. edit all zillion lines of translation (daunting, I couldnt find tool)
2. add 32 seconds of nothing or whatever to the beginning of a video file
No2 may be quicker, but I do not know how.. I am not good with ffmpeg... also, if I want to join some 32 seconds, lets say of my XVid recording, I need to prepare it to be the same as film, so it is also complicated. how to add 32 sec? I tried openShot (couldnt find option). Cinellera is giving me strange errors, about audio codec and something I dont understand... I am confused in using both tools
I am trying to create a shell script where a user can specify a file with a list of logins and the script will create a batch file with specific information in specific columns.
Example:
loginfile.txt has
User1
User2
User3
I need the output to be as below:
1 User1 Date 12/31/9999
2 User2 Date 12/31/9999
3 User3 Date 12/31/9999
Where the columns are separated as below.
1[tab][tab]User1[tab]date +%D[tab]12/31/9999
2[tab][tab]User2[tab]date +%D[tab]12/31/9999
3[tab][tab]User3[tab]date +%D[tab]12/31/9999
I can use the nl utility to get the numbers easily enough, but I need two tab separations between the number and the user list. Is there a sed command that will insert at the beginning of each line? If so I can just run nl after I get some tabs up in the front.
I trying to write a UART(interfacing of serial devices) to linux machine but after I execute the following code to receive data I need to enter key (carriage return).... but I don't want to remove carriage return/enter key
[Code]....
I have a vector that I do not want to call new on during operation so I use the Capacity Feature to allocate all memory at beginning of program
Code:
struct chartype
{
public:
unsigned char value[MAXCHARTYPE_SIZE];
};
[Code].....
Kernel 2.6.21.5, Slackware 12.0
I saved a page from Linuxquestions. It was saved under a filename beginning with '[' (left square bracket). And I now can't delete the file. Unfortunately I cannot send you a screenshot because opening a terminal in the GUI makes ls behave differently. I shall try to describe, assuming the file is in dir '.'. Also let '[SOLVED]foo.html' be the file in question:
Code:
$ ls
<the file is listed>
$ ls [*
/bin/ls: cannot access [*: No such file or directory
$
If I want the hdd to get rid of this file, what should I do? Any hint will be welcome.
i am having two small issues with a function i have made.sorry if it is a mess, i am still learning bash.the first is calling the nonpersistssh function (second line) and assigning the return value to nonpersistdiag.the function returns 1, but nonpersistdiag seems to only contain 0. i am unsure on how to proceed.the second problem is the nested else clause on line 10. it is a syntactical error. how would i declare it correctly?
Code: function endsession(){
nonpersistdiag=$[nonpersistssh]# a function that returns an exit code
sudo /etc/init.d/ssh stop; sshdiag=$?
[code]....
What are the uses of return 0, return 1 and exit statements in C
View 4 Replies View RelatedOn this link [URL]4 a return type is defined
Code:
return ((unsigned int)(unsigned long)base & TBASE_DEFERRABLE_FLAG);
What is the above function returning.I am not clear with definition of what is being returned in the above code.
I'm confused about what "echo $0" in a shell actually return. Consider these tests:
Code:
[root@e11apvl151 ~]# # Login shell:
[root@e11apvl151 ~]# echo $0
-bash
[root@e11apvl151 ~]# # Starting a new shell
[root@e11apvl151 ~]# bash
[root@e11apvl151 ~]# echo $0
bash
[root@e11apvl151 ~]# screen
[root@e11apvl151 ~]# echo $0
/bin/bash
Depending on wether the shell is a login shell, a regular shell, or a screen utility, I get different results.
I have a file:
979798707
787862348
766428634
I want to see if all the records in the file are present in the contents of the files of a particular directory.
Basically I want to say if grep doesn't return anything, then report.
For example in /tmp dir I have 4 files and flast 2 values (787862348 and 766428634) are present in the files of /tmp dir, but first one (979798707) is not. I want to echo that in a reporting file.
something like:
while read line
do
# if ! grep -rl $line /tmp
echo $line >> are_not_present
done < "myFile"
How do I achieve " if ! grep -rl $line /tmp"? That is, if the line is found by grep, then grep will print the output, but if grep does'nt find it, it will print nothing. How can I check if grep didn't find it (i.e. printed nothing)?
I am testing the serial ports on a Single Board Computer(SBC) running Linux kernel 2.6.29. I usually do this by connecting the serial port to another PC serial port, then doing "cat /dev/ttyS0" on PC and "echo hello > /dev/ttyS0" on the SBC. However in the current system, "echo hello > /dev/ttyS0" command does not return at all! Also no characters appear on the destination port. I am running the echo command as root. The system boot messages show that the serial port in indeed /dev/ttyS0.
View 2 Replies View RelatedI think my title pretty much explains it. I am writing a script and I want to start a program in the background, and when that program finishes I want to check the return value to make sure there was no error.For example normal I would do something like this:
#!/bin/sh
program
if [ ! $? -eq 0 ]; then
echo "There was an error"
exit 1
fi
Now I want to do something like this:
#!/bin/sh
PRTN=`program1 &`
program2
if [ ! $? -eq 0 ]; then
[code]....
In this case if program2 finishes before program1, I don't think the return value from program1 $PRTN would be valid at the time it is checked.
I am using pthread_create system call to create a thread. However pthread_create does not return the PID ( process ID). Is there any quick way to fınd the PID of the created thread.
View 1 Replies View RelatedC++ code:
Code:
#include<fstream.h>
[code]....
I write a little script by bash.
#!/bin/bash
a=`gawk '/Iterations /{print $0}' hoge.log | gawk 'BEGIN{FS=" "}{print ($4)}'`
a=`expr 3 '*' $a`
[code]...
I have always encountered this problem in ubuntu bash shell scripts that echo command in a function will be treated as a return value when used in a function. e.g.
[code]...
The output would simply be xyz. Hence the echo seems to function as a "return" command when used in a function with a return value.
$val = mkdir $directory, 755
print $val;
does't create directory but return as value '0'
[code]....
I have confusion regarding pthreads return value. All in short, is the is a valid return value ?
[source]
void * myThrRoutine(void *arg)
{
struct myStruct **myst = (struct myStruct**) arg;
cout<<"In thread "<<(*myst)->var<<(*myst)->msg<<endl;
int x = 20;
pthread_exit((void*)x);
}
[/source]
This seems to work fine on pthread_join , but I want to ensure it is not by chance.