@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@ Example shell scripts useful for many tasks and provided by the community @@ @@ Sat Jun 2 12:22:22 CDT 2001 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@ Guide to Advanced Shell Operations @@@@@ shell script examples @@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ discard the output of a command @ command > dev/null # eliminates output of STDOUT command > /dev/null 2>&1 # redirects STDERR to STDOUT and eliminates them @ use the value of a shell variable in a sed command @ sed "/$DEL/d" file1 > file2 # deletes lines in file1 containing the value of $DEL @ check to see whether a variable has a value @ if [ -z "$VAR" ] ; then list ; fi # list is the command that executes if $VAR doesn't have a value @ determine the full pathname of a directory @ FULLPATH=`(cd dir ; pwd)` # determine full path of directory @ determine the full pathname of a file @ CURDIR=`pwd` # save current directory path cd `dirname file` # change to directory with the file FULLPATH="`pwd`/`basename file`" # join output of pwd and filename cd $CURDIR # go back to the original directory @ rename all the *.html files to *.php in a directory @ OLDSUFFIX=html # variable with old suffix NEWSUFFIX=php # variable with new suffix for FILE in *."$OLDSUFFIX" # all files that start with old suffix do NEWNAME=`echo "$FILE" | sed -e "s/${OLDSUFFIX}\$/$NEWSUFFIX/"` mv "$FILE" "$NEWFILE" # sed does a replace and then mv done # to move the files @ rename all the *.html files to *.htm using bash pattern matching @ for i in *.html; do if [ -f ${i%l} ]; then echo ${i%l} already exists else mv $i ${i%l} fi done @ rename all default* files to index* @ OLDPREFIX=default # variables with old and new prefix NEWPREFIX=index # for loop for all files with prefix for FILE in "$OLDPREFIX"* # sed -e for script, s for substitute do # carrot indicates start of line NEWNAME=`echo "$FILE" | sed -e "s/^${OLDPREFIX}/$NEWPREFIX/"` mv "$FILE" "$NEWNAME" done # rename the file and exit loop @ rename variations, example removes Shortcut to from beginning of files @ OLD="Shortcut to "; NEW=""; for FILE in "$OLD"*; do; NEWNAME=`echo "$FILE" | sed -e "s/^${OLD}/$NEW/"`; mv "$FILE" "$NEWNAME"; echo "$NEWNAME"; done # places everything from above script on a single line, does a substitute OLD="Shortcut to "; for FILE in "$OLD"*; do NEWNAME=`echo "$FILE" | sed -e "s/^${OLD}//"`; mv "$FILE" "$NEWNAME"; echo "$NEWNAME"; done # since it is not a substitute, this uses 1 variable but still echos each file as it is processed OLD="Shortcut to "; for FILE in "$OLD"*; do NEWNAME=`echo "$FILE" | sed -e "s/^${OLD}//"`; mv "$FILE" "$NEWNAME"; done # eliminate unecessary echo of filename for FILE in "Shortcut to "*; do N=`echo "$FILE" | sed -e "s/^Shortcut\ to\ //"`; mv "$FILE" "$N"; done # shortest method, eliminates use of variables and filename echo @ set all filenames in a directory to lowercase @ for FILE in * # use mv -i to avoid overwriting files do # uses the tr command to convert case mv -i "$FILE" `echo "$FILE" | tr '[A-Z]' '[a-z]'` 2> /dev/null done @ eliminate msdos carriage returns in files @ # dos uses \r\n (^M) where UNIX uses only \n tr -d '\015' < file1 > file2 # file1 contains carriage returns, file2 is created without carriage returns # the \015 is oct representation of dos carriage returns -new entries- @ search and replace a text string with another in multiple files @ for e in *; do mv $e $e.tmp ; sed 's/STRING1/STRING2/g' <$e.tmp >$e ; rm -f $e.tmp ; done (works best in a directory without subdirectories; it does bad things to subdirectories) @ replace a text string with another in files and recurse into directories @ for e in `find . -type f`; do mv $e $e.tmp ; sed 's/STRING1/STRING2/g' <$e.tmp >$e ; rm -f $e.tmp ; done @ test to see if a file exists and print true if it does if test -e /tmp/seclog.pid ; then echo "true"; fi -lazygirl 4/29/2002 @ replace linux line feeds in file containing a LF delimited list with a comma and space single line list. (file had space between last char and LF) @ sed 's/.$/,\ /g' < parseme.txt > tmpfile.txt; tr -d '\012' < tmpfile.txt > outfile.txt -lazygirl 8/23/2004 @ compare IP address to C block and if it is part of that network @ host24=${ipaddress%.*} if [ "${host24}" = "192.168.30" ]; then echo "${ipaddress}"; fi -Sun Nov 14 15:30:55 CST 2004 @ useful 'c' like FOR loop (for/next) for bash @ for i in `seq 0 99`; do echo number $i done -krissyj Dec 2004 @ unzip a directory of zip files all at once @ for FILE in *.zip; do unzip "$FILE"; done @ convert list of usernames into delete user shell script @ :1,$s/^\(.*\)/userdel -r \1/ @ live active monitoring of tcp connections from the shell @ while $x <> 1; do clear echo "Current TCP connections for robotz.com" netstat -np|grep "tcp\ "; sleep 15s done @ old fashioned replace text string for every file in directory @ change string1 to string2 in every file within the directory for e in *; do sed 's///g' $e >$e.tmp; rm -f $e; mv $e.tmp $e; done @ strip HTML tags out of a text/html file. This works unless a tag is split @ and ends on the following line, such as long a href tags e=index.html; sed 's/<[^>]*>//g' $e >$e.tmp; mv $e.tmp $e [[added to wiki.robotz.com 5/22/2007]]