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Full Discussion: Using sed to edit multiple files
Top Forums Shell Programming and Scripting Using sed to edit multiple files Post 303028321 by bakunin on Friday 4th of January 2019 10:52:31 AM
Old 01-04-2019
Quote:
Originally Posted by edstevens
Created a shell script to invoke sed to edit multiple files, but am missing something.
Here's the shell script:
Code:
oracle:$ cat edit_scripts.sh
#!/bin/sh
#------------------------------------------------------------------------------
# edit_scripts.sh
#
# This script executes sed to make global edits to the template files
#------------------------------------------------------------------------------
for i in *.sh; do
  sed -f script.sed < $i
done
#
for i in *.sql; do
  sed -f script.sed < $i
done

The problem is in this line:

Code:
sed -f script.sed < $i

First, sed doesn't need a redirection because it can work on files. Notice that i quoted "$i" because otherwise files with blanks in their names would break your script. It is generally a good idea to religiously quote whatever is quotable in shell scripts - it just comes with the impulse to convert the infidels, like i am doing to you right now. ;-)

Code:
sed -f script.sed  "$i"

Second, sed puts it output to <stdout> as per default. Probably it did do the changes but they were shown on your screen, not your file. To make the changes lasting you need to redirect this output into a (new!) file and only then move that file over the old one. As an additional measure of caution only do so if sed returned 0. This guards against i.e. disk-full-conditions where the output cannot be written (fully) to the disk and you move then a corrupt script over a perfectly fine template:

Code:
if sed -f script.sed  "$i" > "$i".tmp ; then
     mv "$i".tmp "$i"
fi

I hope this helps.

bakunin
 

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LEARN ABOUT X11R4

idle

IDLE(1) 						      General Commands Manual							   IDLE(1)

NAME

       IDLE - An Integrated DeveLopment Environment for Python

SYNTAX

       idle [ -dins ] [ -t title ] [ file ...]

       idle [ -dins ] [ -t title ] ( -c cmd | -r file ) [ arg ...]

       idle [ -dins ] [ -t title ] - [ arg ...]

DESCRIPTION

       This  manual page documents briefly the idle command.  This manual page was written for Debian because the original program does not have a
       manual page.  For more information, refer to IDLE's help menu.

       IDLE is an Integrated DeveLopment Environment for Python. IDLE is based on Tkinter, Python's bindings to the Tk widget  set.  Features  are
       100%  pure  Python, multi-windows with multiple undo and Python colorizing, a Python shell window subclass, a debugger. IDLE is cross-plat-
       form, i.e. it works on all platforms where Tk is installed.

OPTIONS

       -h     Print this help message and exit.

       -n     Run IDLE without a subprocess (see Help/IDLE Help for details).

       The following options will override the IDLE 'settings' configuration:

       -e     Open an edit window.

       -i     Open a shell window.

       The following options imply -i and will open a shell:

       -c cmd Run the command in a shell, or

       -r file
	      Run script from file.

       -d     Enable the debugger.

       -s     Run $IDLESTARTUP or $PYTHONSTARTUP before anything else.

       -t title
	      Set title of shell window.

       A default edit window will be bypassed when -c, -r, or - are used.

       [arg]* and [file]* are passed to the command (-c) or script (-r) in sys.argv[1:].

EXAMPLES

       idle   Open an edit window or shell depending on IDLE's configuration.

       idle foo.py foobar.py
	      Edit the files, also open a shell if configured to start with shell.

       idle -est "Baz" foo.py
	      Run $IDLESTARTUP or $PYTHONSTARTUP, edit foo.py, and open a shell window with the title "Baz".

       idle -c "import sys; print sys.argv" "foo"
	      Open a shell window and run the command, passing "-c" in sys.argv[0] and "foo" in sys.argv[1].

       idle -d -s -r foo.py "Hello World"
	      Open a shell window, run a startup script, enable the debugger, and run foo.py, passing "foo.py" in sys.argv[0] and "Hello World" in
	      sys.argv[1].

       echo "import sys; print sys.argv" | idle - "foobar"
	      Open a shell window, run the script piped in, passing '' in sys.argv[0] and "foobar" in sys.argv[1].

SEE ALSO

       python(1).

AUTHORS

       Various.

								 21 September 2004							   IDLE(1)
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