You are most welcome to forum, hope you will enjoy learning here. echo $$ will be used to write PID of the current shell.
So tmp$$ is just a Temporary file created in above code, which is later renamed to actual file. Complete explanation is as follows.
Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
Hi,
I have a data file with following structure:
a|b|c|d|3|f1|f2|f3
a|b|c|d|5|f1|f2|f3|f4|f5
I want to change this data to:
a|b|c|d|3|f1;f2;f3
a|b|c|d|5|f1;f2;f3;f4;f5
Data in column 5 tells the number of following fields. All fields delimiter after the 5th column needs to be... (6 Replies)
I am trying to use sed to replace specific characters at a specific position in the file with a different value... can this be done?
Example:
File:
A0199999123
A0199999124
A0199999125
Need to replace 99999 in positions 3-7 with 88888.
Any help is appreciated. (5 Replies)
Hi,
I have file as below:
5 6 7
4 8 9
3 5 6
output needs to be another file with 4th column as $1+$2 and 5th column as $3+$4.
sample output file
5 6 7 11 18
4 8 9 12 21
3 5 6 8 14
Anybody have answer
Thanks in advance (3 Replies)
Greetings.
I don't have experience programing scripts. I need to insert a string in a specific position of another string on another file (last.cfg), for example:
File last.cfg before using script:
login_interval=1800
lcs.machinename=client04
File last.cfg after using script:... (4 Replies)
Hello experts,
I am new to this group and to 'SED' and 'AWK'. I have data (text file) with 5 columns (C_1-5) and 100s of lines (only 10 lines are shown below as an example). I have to find or select only the id numbers (C-1) of specific lines with '90' in the same line (of C_3) AND with '20' in... (6 Replies)
Hi all!
I need to change the final e every time when it is present in any word in column 1 to a; moreover, to change the final i again to a in any word in column 1, but just if word in column 2 begins with ha or si.
Here below you can see a sample of my data:
achwa ungeliachwa ungeli 1... (3 Replies)
Hi,
I made following configuration to create user directory:
# authconfig --enablemkhomedir --update
But the directory is created as permission 755, I'd like to modify the script to change directory access permission to 700, where is the script which copies /etc/skel to /home... (0 Replies)
Hello,
i need help with awk.
I have this file:
cat number
DirB port 67 er_enc_out 0 er_bad_os 0
DirB port 71 er_enc_out 56 er_bad_os 0
DirB port 74 er_enc_out 0 er_bad_os 0
DirB port 75 ... (4 Replies)
What is the proper syntax to add specific text to a column in a file? Both the input and output below are tab-delineated. What if there are multiple text/fields, such as /CP&/2 /CM&/3 /AA&/4 Thank you :).
sed 's/*/Index&/1' del.txt.hg19_multianno.txt > matrix.del.txt (4 Replies)
Discussion started by: cmccabe
4 Replies
LEARN ABOUT REDHAT
mktemp
MKTEMP(1) BSD General Commands Manual MKTEMP(1)NAME
mktemp -- make temporary file name (unique)
SYNOPSIS
mktemp [-d] [-q] [-u] template
DESCRIPTION
The mktemp utility takes the given file name template and overwrites a portion of it to create a file name. This file name is unique and
suitable for use by the application. The template may be any file name with at least 6 of 'Xs' appended to it, for example /tmp/temp.XXXXXX.
The trailing 'Xs' are replaced with the current process number and/or a unique letter combination. The number of unique file names mktemp
can return depends on the number of 'Xs' provided; six 'Xs' will result in mktemp testing roughly 26 ** 6 combinations.
If mktemp can successfully generate a unique file name, the file is created with mode 0600 (unless the -u flag is given) and the filename is
printed to standard output.
OPTIONS
The available options are as follows:
-d Make a directory instead of a file.
-q Fail silently if an error occurs. This is useful if a script does not want error output to go to standard error.
-u Operate in ``unsafe'' mode. The temp file will be unlinked before mktemp exits. This is slightly better than mktemp(3) but still
introduces a race condition. Use of this option is not encouraged.
RETURN VALUES
The mktemp utility exits with a value of 0 on success, and 1 on failure.
EXAMPLES
The following sh(1) fragment illustrates a simple use of mktemp where the script should quit if it cannot get a safe temporary file.
TMPFILE=`mktemp /tmp/$0.XXXXXX` || exit 1
echo "program output" >> $TMPFILE
In this case, we want the script to catch the error itself.
TMPFILE=`mktemp -q /tmp/$0.XXXXXX`
if [ $? -ne 0 ]; then
echo "$0: Can't create temp file, exiting..."
exit 1
fi
Note that one can also check to see that $TMPFILE is zero length instead of checking $?. This would allow the check to be done later one in
the script (since $? would get clobbered by the next shell command).
SEE ALSO mkstemp(3), mktemp(3)HISTORY
The mktemp utility appeared in OpenBSD.
BSD November, 20, 1996 BSD