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Full Discussion: Problem updated file with new entries
Top Forums Shell Programming and Scripting Problem updated file with new entries Post 302365340 by Scrutinizer on Monday 26th of October 2009 05:38:41 PM
Old 10-26-2009
OK in that case, if your sed has the -i option you could do something like:
Code:
#!/bin/sh
cp -p FileB FileB.new
while read old new; do
  sed -i "s/$old$/$new/" FileB.new
done < FileA

though a tad expensive, continually updating fileB.new, but I think less expensive than two read loops...

With awk it is more efficient and faster too.
Code:
awk 'NR==FNR {A[$1]=$2;next} A[$3]{$3=A[$3]} 1' FileA FileB > FileB.new

And alternatively with ksh it is efficient and fast too:

Code:
#!/bin/ksh
typeset -A newname;
while read old new; do
  newname[$old]=$new
done < FileA

while read field1a field1b empl; do
  if [[ -n ${newname[$empl]} ]]; then
    empl=${newname[$empl]}
  fi
  echo "$field1a $field1b $empl"
done < FileB > FileB.new

 

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LEARN ABOUT SUSE

alter_tablespace

ALTER 
TABLESPACE(7)						   SQL Commands 					       ALTER TABLESPACE(7)

NAME

       ALTER TABLESPACE - change the definition of a tablespace

SYNOPSIS

       ALTER TABLESPACE name RENAME TO newname
       ALTER TABLESPACE name OWNER TO newowner

DESCRIPTION

       ALTER TABLESPACE changes the definition of a tablespace.

       You  must  own  the tablespace to use ALTER TABLESPACE.	To alter the owner, you must also be a direct or indirect member of the new owning
       role.  (Note that superusers have these privileges automatically.)

PARAMETERS

       name   The name of an existing tablespace.

       newname
	      The new name of the tablespace. The new name cannot begin with pg_, as such names are reserved for system tablespaces.

       newowner
	      The new owner of the tablespace.

EXAMPLES

       Rename tablespace index_space to fast_raid:

       ALTER TABLESPACE index_space RENAME TO fast_raid;

       Change the owner of tablespace index_space:

       ALTER TABLESPACE index_space OWNER TO mary;

COMPATIBILITY

       There is no ALTER TABLESPACE statement in the SQL standard.

SEE ALSO

       CREATE TABLESPACE [create_tablespace(7)], DROP TABLESPACE [drop_tablespace(7)]

SQL - Language Statements					    2010-05-14						       ALTER TABLESPACE(7)
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