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Full Discussion: Sed save changes to same file in loop
Top Forums Shell Programming and Scripting Sed save changes to same file in loop Post 302441565 by Scott on Sunday 1st of August 2010 05:48:02 AM
Old 08-01-2010
Hi.

You need double quotes around the sed, otherwise the shell won't expand $i.

Also, after deleting each field, you need to subtract 1 from other field numbers (what was field 2, after deleting field 1, will now be the new field 1).

And for it to work on the last field, you need either to modify the sed, or add a semi-colon to the end of the line:

Code:
$ cat sedTest
file=file1
temp=file1.out

var="1;6"
IFS=";"

X=0
for i in $var
do
  I=$((i - X))
  sed "s/$/;/;s/[^;][^;]*;/;/$I;s/;$//" $file> $temp 
  X=$((X + 1))
  mv $temp $file
done

cat $file

$ ./sedTest
;31-JUL-10;29-JUL-10;29-JUL-10;30-JUL-10;
;31-JUL-10;29-JUL-10;29-JUL-10;30-JUL-10;
;31-JUL-10;29-JUL-10;29-JUL-10;30-JUL-10;

$ # with var="1;2"

$ ./sedTest
$ ./sedTest
;;29-JUL-10;29-JUL-10;30-JUL-10;30-JUL-10
;;29-JUL-10;29-JUL-10;30-JUL-10;30-JUL-10
;;29-JUL-10;29-JUL-10;30-JUL-10;30-JUL-10

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LEARN ABOUT PHP

logsave

LOGSAVE(8)						      System Manager's Manual							LOGSAVE(8)

NAME

       logsave - save the output of a command in a logfile

SYNOPSIS

       logsave [ -asv ] logfile cmd_prog [ ... ]

DESCRIPTION

       The  logsave  program  will  execute  cmd_prog with the specified argument(s), and save a copy of its output to logfile.  If the containing
       directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out.	A copy of the output  will
       also be written to standard output.

       If  cmd_prog  is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in
       logfile

       logsave is useful for saving the output of initial boot scripts until the /var partition is mounted,  so  the  output  can  be  written	to
       /var/log.

OPTIONS

       -a     This option will cause the output to be appended to logfile, instead of replacing its current contents.

       -s     This  option  will  cause  logsave  to  skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of
	      Header) and control-B (ASCII 002 or Start of Text).  This allows progress bar information to be visible to the user on the  console,
	      while not being written to the log file.

       -v     This option will make logsave to be more verbose in its output to the user.

AUTHOR

       Theodore Ts'o (tytso@mit.edu)

SEE ALSO

       fsck(8)

E2fsprogs version 1.44.1					    March 2018								LOGSAVE(8)
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