For each line it contains, you want to do the following
You want to read a file called fruits
For each line, you want to display the current colour followed by the current fruit
If you are in a shell script (ksh, bash, etc.) you need to have a loop to read in each file similar to this:-
Other coding options will exist for awk, sed, perl, csh and the list goes on. This is why it would be good to know what you are starting with this issue. What are you experienced in? That's normally a good way to think about things.
Is this homework perhaps? If so, there is a homework forum.
Does that help? Would you like to experiment and let us know how you get on?
Robin
These 2 Users Gave Thanks to rbatte1 For This Post:
Dear community,
I'm quite a newbie with scripting, I have this problem:
I have a file with many lines and I want to copy the lines from 1 to N to file.1, from N+1 to 2N to file.2, and so on up to the end of the file
I have tried with something like this (N=43 in this example):
awk '{for... (2 Replies)
I'm kinda stuck on this one, I have 7 files with 30.000 lines/file like this
050 0.023 0.504336
050 0.024 0.529521
050 0.025 0.538908
050 0.026 0.537035
I want to find the mean line by line of the third column from the files named like this:
Stat-f-1.dat .... Stat-f-7.dat
Stat-s-1.dat... (8 Replies)
Friends
I need to have a shell script which will feed variables from two different files line-by-line. For example, I have two files - permission and file_name.
Contents of permission is -
644
755
....
contents of file_name
/file1
/file2
.....
Now I want 644 permission will be... (4 Replies)
Hi All,
I'm trying to figure out which are the trusted-ips and which are not using a script file.. I have a file named 'ip-list.txt' which contains some ip addresses and another file named 'trusted-ip-list.txt' which also contains some ip addresses. I want to read a line from... (4 Replies)
Hello,
I was wondering if anyone knows a faster way to search and compare strings and dates from 2 files?
I'm currently using "for loop" but seems sluggish as i have to cycle through 10 directories with 10 files each containing thousands of lines.
Given:
-10 directories
-10 files... (4 Replies)
Friends,
I am in need to delete files from a directory on a regular basis. I want to place all the files to be deleted in delete .txt file and require a script to delete files, line by line from this delete.txt file. Please help me with this script as am new to unix scripting. (3 Replies)
I am looking for help in processing of those options: '-n' or '-p'
I understand what they do and how to use them.
But, I would like to use them with more than one file (and without any shell-loop; loading the 'perl' once.)
I did try it and -n works on 2 files.
Question is:
- is it possible to... (6 Replies)
I want to read the log file which was generate from other command . And the output was having multi line in log files for job name and server name. But i need to make all the logs on one line
Source file
07/15/2018 17:02:00 TRANSLOG_1700 Server0005_SQL ... (2 Replies)
sem_post(2) System Calls Manual sem_post(2)NAME
sem_post - unlock a POSIX semaphore
SYNOPSIS DESCRIPTION
is used to post the semaphore referenced by sem. The calling thread will not return from its call to unless it can either: increment the
semaphore value, if there are no blocked threads on this semaphore; give the semaphore to a blocked thread, if there are any blocked
threads on this semaphore; or have an error condition.
If the semaphore value is < 0, the semaphore has blocked threads, waiting for it to become available (the absolute value of the semaphore's
value indicates the number of waiters at that moment). If the semaphore value is >= 0, the semaphore has no waiters.
If the semaphore has no waiters at the time its value is checked, the semaphore's value will be atomically incremented, with respect to the
checking of its value, up to its maximum value as specified by If the semaphore has waiters at the time its value is checked, the semaphore
value is not changed. Instead, the calling thread will attempt to wake up a waiter. If the semaphore has waiters having realtime priori-
ties, the thread must wake up the highest priority waiter. Otherwise the thread at the head of the channel queue is woken up.
When a waiter is successfully woken, the semaphore being posted will be given to the woken waiter. In other words, the state of the sema-
phore remains unchanged. Instead, the semaphore being posted will be inherited by the waiter being woken from this call to
If the specified semaphore referred to by sem is a named semaphore, then this semaphore must have been opened by the calling process with
The calling process must have both read and write permissions on the semaphore to perform this operation. The routine may be called asyn-
chronously, i.e. from a signal handler.
To use this function, link in the realtime library by specifying on the compiler or linker command line.
EXAMPLES
The following call to will post the semaphore sem.
RETURN VALUE
A successful call to will return 0 and the calling thread would have posted the semaphore. Otherwise, the call to will return -1 with
errno set to the appropriate value of the error condition.
ERRORS
fails and does not perform the requested operation if any of the following conditions are encountered:
[EPERM] The calling process does not have the privileges necessary to post the semaphore.
[EINVAL] The argument sem does not refer to a valid semaphore.
SEE ALSO
<semaphore.h>.
STANDARDS CONFORMANCE sem_post(2)