Linux Script Examples

A makefile script example

Scripting that checks a file and modifies it if required. Since it is from a makefile, this file is similar to a normal script but is slightly modified with lines that end with ";\" characters. This section demonstrates modification of the rc.local file from a makefile so a script program, "printst", may be run in the background when the system starts. The variable "BINLOC" is defined earlier with the line "BINLOC = /usr/local/tmp". See the section on "Making Packages" under the header "Making makefiles".

# Add the path for $(BINLOC) to the /etc/rc.d/rc.local file
	@PATHIN=`grep "path=" /etc/rc.d/rc.local | grep "$(BINLOC)"`; \  # See if the BINLOC path is set in the rc.local file
	HEADER=""; \
	if \
	   [ -z "$$PATHIN" ]; \
	then \
	   echo Adding $(BINLOC) to path in /etc/rc.d/rc.local; \
	   echo >> /etc/rc.d/rc.local; \
	   echo "###### Added by Print Service Install on `date` by `whoami`" >> /etc/rc.d.rc.local; \
	   HEADER=Y; \
	   echo "export PATH=\$$PATH:$(BINLOC)" >> /etc/rc.d.rc.local; \
	else \
	   echo $(BINLOC) already set in path in file /etc/rc.d/rc.local; \
	fi; \
	PRINTST=`grep -i "printst &" /etc/rc.d/rc.local`; \  # See if the string printst is in the rc.local file
	if \
	   [ -z "$$PRINTST" ]; \
	then \
	   echo Adding printst command to /etc/rc.d/rc.local file; \
	   if \
	      [ -z "$$HEADER" ]; \
	   then \
	      echo >> /etc/rc.d.rc.local; \
	      echo "###### Added by Print Service Install on `date` by `whoami`" >> /etc/rc.d.rc.local; \
	      HEADER=Y; \
	   fi; \
	   echo "printst &" >> /etc/rc.d.rc.local; \
	else \
	   echo Already have printst command in /etc/rc.d/rc.local file; \
	fi; \
	if \
	   [ -n "$$HEADER" ]; \
	then \
	   echo "###### End of Print Service Install Section ######"  >> /etc/rc.d.rc.local; \
	   echo >> /etc/rc.d.rc.local; \
	fi;