01-26-2010
tr command
Hi.
This is my first post,
I am trying to change certain sections of a file from UPPERCASE to lowercase. For this I am using the tr command. The thing is it is changing all of the text in the file to lowercase. My question is "can you use pattern matching or something in conjunction with tr to selectively change text?"
Eg: my code is
line_x (P) { ....
line_y (Q) { ...........
line_z(P Q) {..............
I only want to make whatever is in line_y to lowercase.
(there are multiple instances of line y)
Currently I am doing something like this:
tr "*(line_y ([A-Z]) {)" "*(line_y ([a-z]) {)" < file.orig > file.mod
but this is still just making all text lower case.
Any help or input would be greatly appreciated.
Kind Regards,
Colum.
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CHSH(1) User Commands CHSH(1)
NAME
chsh - change login shell
SYNOPSIS
chsh [options] [LOGIN]
DESCRIPTION
The chsh command changes the user login shell. This determines the name of the user's initial login command. A normal user may only change
the login shell for her own account; the superuser may change the login shell for any account.
OPTIONS
The options which apply to the chsh command are:
-h, --help
Display help message and exit.
-R, --root CHROOT_DIR
Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.
-s, --shell SHELL
The name of the user's new login shell. Setting this field to blank causes the system to select the default login shell.
If the -s option is not selected, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter the new
value to change the shell, or leave the line blank to use the current one. The current shell is displayed between a pair of [ ] marks.
NOTE
The only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the superuser,
and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason, placing /bin/rsh
in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell
back to its original value.
FILES
/etc/passwd
User account information.
/etc/shells
List of valid login shells.
/etc/login.defs
Shadow password suite configuration.
SEE ALSO
chfn(1), login.defs(5), passwd(5).
shadow-utils 4.5 01/25/2018 CHSH(1)