09-09-2008
problems with sed and bash. Escaped characters ?
Hi, I'm writing a long script for bash (on RHEL 5.0) to execute many commands. So, my idea is to create a function to deal with error checking and logging (see ceckoutput() below). This works with all commands except for sed. I think it may be a problems with escaped characters. So I did the following tests :
bash-3.00$ bin/sed -i -e 's/\(.* \)/\1 console=ttyS0,115200/' grub.conf
bash-3.00$ echo $?
0
bash-3.00$ export cmnd="/bin/sed -i -e 's/\(.* \)/\1 console=ttyS0,115200/' grub.conf"
bash-3.00$ echo $cmnd
/bin/sed -i -e 's/\(.*\)/\1 console=ttyS0,115200/' grub.conf
bash-3.00$ $cmnd
/bin/sed: -e expression #1, char 1: unknown command: `''
I even tried changing the quotes to avoid shell substitutions:
export cmnd='/bin/sed -i -e "s%\(.*\)%\1 console=ttyS0,115200%" grub.conf'
bash-3.00$ $cmnd
/bin/sed: -e expression #1, char 1: unknown command: `"'
Any ideas why this is happening?
Would it be a good idea idea to use awk to edit the file ? if so please help me with that command.
ceckoutput (){
$1 2>&1 |tee -a $LOGFILE
if [ ${PIPESTATUS[0]} -ne 0 ];then
echo "Error in installation!! See $LOGFILE"
exit 1
fi
}
Regards,
MacL
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LEARN ABOUT SUNOS
setusershell
getusershell(3C) Standard C Library Functions getusershell(3C)
NAME
getusershell, setusershell, endusershell - get legal user shells
SYNOPSIS
#include <unistd.h>
char *getusershell(void);
void setusershell(void);
void endusershell(void);
DESCRIPTION
The getusershell() function returns a pointer to a legal user shell as defined by the system manager in the file /etc/shells. If
/etc/shells does not exist, the following locations of the standard system shells are used in its place:
/bin/bash /bin/csh
/bin/jsh /bin/ksh
/bin/pfcsh /bin/pfksh
/bin/pfsh /bin/sh
/bin/tcsh /bin/zsh
/sbin/jsh /sbin/pfsh
/sbin/sh /usr/bin/bash
/usr/bin/csh /usr/bin/jsh
/usr/bin/ksh /usr/bin/pfcsh
/usr/bin/pfksh /usr/bin/pfsh
/usr/bin/sh /usr/bin/tcsh
/usr/bin/zsh /usr/xpg4/bin/sh
The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.
The setusershell() function rewinds the file or the list.
The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.
RETURN VALUES
The getusershell() function returns a null pointer on EOF.
BUGS
All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.
SunOS 5.10 30 Aug 2004 getusershell(3C)