Permissions

add write access to current permissions for a file	chmod g+w filename
remove all access for this directory and subdirectories	chmod -r go-rwx *
remove write access from everyone but you	chmod go-w filename
replace current permissions for a file with those specifiedu=user, g=group, o=othersr=read, w=write, x=execute	chmod u=rwx,g=rwx,o=rwx filename
change group associated with files	chgrp newgroup filename
add all permissions for everyone	chmod 777 filename
change ownership of files	chown newowner filename

Just Some Miscellaneous Notes

Man / More / Less

[Spacebar]  view next screen
[Enter]      view a line at a time
b            view previous screen
q                    quit viewing

Naming Files

The system will allow a file to be created with the same name as a directory.

The system will allow a space in a name, but some programs have trouble with it.

Use periods or underscores to separate characters.

Documenting a Unix Script

#! /usr/bin/ksh
echo "# +-----------------------------------------------------------------------"
echo "# | Program ID:    scriptname.sh"
echo "# |"
echo "# | Purpose:       description"
echo "# |"
echo "# | Developer:     Lynn Tobias"
echo "# | Program Date:  mm/dd/yyyy"
echo "# |"
echo "# | Input File(s): /ux123/scripts/YES              -- 'Y' for prompts"
echo "# |                /ux123/scripts/ods_uat.password -- sql+ password"
echo "# |"
echo "# | Table(s) Used: EXT_BLDLIST"
echo "# |"
echo "# | Called by:     ?"
echo "# | Calls:         scriptname.pl"
echo "# |"
echo "# | Output:        /ux123/scripts/blddist.file10"
echo "# |                "
echo "# | Revisions:     Dvlpr Date     Version Comment/Change"
echo "# |                ----- -------- ------- --------------------------------"
echo "# |"
echo "# +-----------------------------------------------------------------------"

SQLPlus in a Here Document

This is called a 'here document' - because it says "here is the text for your input". The redirection expressed as "<<EOF" says "take what follows as though I typed it at the keyboard, until you find a token to match EOF as the first token on a line". The token EOF has no special meaning - it's just a string of characters used as a marker to tell the 'here document' when the text input is completed.

sqlplus <<EOF

      Select something

       from somewhere;

EOF

Important: the ending token must appear as the first characters on a line by itself.

Thanks to Jim Benz of Pittsburgh for these notes.

Password Variables

#! /usr/bin/ksh

echo "#------------------------------------------------------------------------------"
echo "# get passwords for the ftp and for sqlplus and assign to variables."
echo "#------------------------------------------------------------------------------"

export FTP_PASS='cat /ux123/dfact/xlt/scripts/ust_grp.password'

export SQL_PASS='cat /ux123/dfact/xlt/scripts/xlt_ods_uat.password'

echo "#------------------------------------------------------------------------------"
echo "# start ftp from vax --i: turn off prompting    n: turn off login"
echo "#------------------------------------------------------------------------------"

ftp -in host1 <
quote user ust_grp
quote pass $FTP_PASS
...
quit
EOF

echo "#------------------------------------------------------------------------------"
echo "# In SQL+, ...
echo "#------------------------------------------------------------------------------"

sqlplus -s  $SQL_PASS << EOF
.
.
exit;
EOF

Directory Listing

Grep

match any character	.	grep l..n filename	finds 'lynn' or 'loan'
match only if at the beginning of a line	^	grep ^day filename	finds 'day into night'but not 'Some day'
match only if at the end of the line	$	grep day$ filename	finds 'One fine day'but not 'Monday is good'
search for '.' or '^' or '$' in a file	\	grep \* filename	finds '*****1.05'
search for a set of names	[]	grep [dog,dil]bert filename	finds 'dogbert' and 'dilbert'
find all lines that start with an alphabetic character in upper or lower case	^[]	grep ^[A-Z,a-z] filename