UNIX for Dummies Questions & Answers

pscc_status.sh
infaprd1_status.sh
dgtst.sh
dgwk.sh
test1.sh
time2.sh

# Create a backup.
# Essential when batch-editing lots of files I believe.  If something
# goes horribly wrong you could lose ALL your scripts otherwise.
tar -cpf /path/to/backup.tar *.sh

for FILE in *.sh
do
        # sed can't search/replace in place, you have to create a new file and
        # overwrite the old.
        sed "s#user@wherever#user@whenever#g" < "$FILE" >/tmp/$$
        # cat is better than mv or copy here, because it won't alter the original
        # file's permissions.
        cat /tmp/$$ > "$FILE"
done

rm -f /tmp/$$

for FILE in *.sh
do
        # sed can't search/replace in place, you have to create a new file and
        # overwrite the old.
        sed "s#user@wherever#user@whenever#g" < "$FILE" >/tmp/$$
        # cat is better than mv or copy here, because it won't alter the original
        # file's permissions.
        cat /tmp/$$ > "$FILE"
done

s - substitute
# - chosen seperator for s (most often is '/' in other examples) 
"user@wherever" - string to be matched
"user@whenever" - string to replace matched string
g - global change
< "$FILE" - take input from $FILE
>/tmp/$$ - output to a file named like pid of running script ($$)

>/tmp/$$ - output to a file named like pid of running script ($$)