best way to insert a line at the top of a file? Post: 302285780

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insert text into top of file

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append a line into a file in the top

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I'm trying to take mrt output and put it at the top of a file along with the date and time. I was able to do it at the bottom of the file with the following printf "********** $(date) **********\n\n" >> $OUTPUT_PATH/$HOSTNAME mtr -r -w -c 10 $HOSTADDRESS >> $OUTPUT_PATH/$HOSTNAME printf...

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Insert a line of text on nth line of a file

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LEARN ABOUT X11R4

tmpfile

TMPFILE(3)						     Linux Programmer's Manual							TMPFILE(3)

NAME

       tmpfile - create a temporary file

SYNOPSIS

       #include <stdio.h>

       FILE *tmpfile(void);

DESCRIPTION

       The  tmpfile()  function  opens a unique temporary file in binary read/write (w+b) mode.  The file will be automatically deleted when it is
       closed or the program terminates.

RETURN VALUE

       The tmpfile() function returns a stream descriptor, or NULL if a unique filename cannot be generated or the unique file cannot  be  opened.
       In the latter case, errno is set to indicate the error.

ERRORS

       EACCES Search permission denied for directory in file's path prefix.

       EEXIST Unable to generate a unique filename.

       EINTR  The call was interrupted by a signal; see signal(7).

       EMFILE The per-process limit on the number of open file descriptors has been reached.

       ENFILE The system-wide limit on the total number of open files has been reached.

       ENOSPC There was no room in the directory to add the new filename.

       EROFS  Read-only filesystem.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +----------+---------------+---------+
       |Interface | Attribute	  | Value   |
       +----------+---------------+---------+
       |tmpfile() | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD, SUSv2.

NOTES

       POSIX.1-2001 specifies: an error message may be written to stdout if the stream cannot be opened.

       The  standard does not specify the directory that tmpfile() will use.  Glibc will try the path prefix P_tmpdir defined in <stdio.h>, and if
       that fails the directory /tmp.

SEE ALSO

       exit(3), mkstemp(3), mktemp(3), tempnam(3), tmpnam(3)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

								    2016-03-15								TMPFILE(3)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

SED- Insert text at top of file

Discussion started by: MBGPS

2. UNIX for Advanced & Expert Users

Insert a line as the first line into a very huge file

Discussion started by: shriek

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insert text into top of file

Discussion started by: jimbob

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how do I insert argument into TOP of file using vi?

Discussion started by: rprules