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Annotation of 43BSDTahoe/new/help/src/f77/disk_space, revision 1.1.1.1

1.1       root        1: .TI F77/DISK_SPACE "Sep. 4, 1985"
                      2: Minimizing Use of Disk Space
                      3: 
                      4: You can save disk space by removing object ('.o') files, and
                      5: executable modules ('a.out' files), and core dumps ('core' files)
                      6: when they will no longer be used.
                      7: 
                      8: You can use the 'find' command to delete all core dumps in your
                      9: account:
                     10: 
                     11:        find ~ -name core -exec /bin/rm {} \\;
                     12: 
                     13: Find can also be used to remove all '.o' files
                     14: not accessed in the last week:
                     15: 
                     16:        find ~ -name '*.o' -atime +7 -exec /bin/rm {} \\;
                     17: 
                     18: In the following, it looks for modules and then removes them
                     19: only if you say 'y' in response to a query:
                     20: 
                     21:        find ~ -name '*.out' -atime +7 -exec /bin/rm -i {} \\;
                     22: 
                     23: Change ``~'' to ``.'' to look only in the current directory
                     24: and its subdirectories.
                     25: See "man 1 find" for more information on 'find'.
                     26: 
                     27: If you don't use the debugger, then there is no point in ever saving
                     28: core dumps in files; to prevent this, add:
                     29: 
                     30:        limit coredumpsize 0
                     31: 
                     32: in your .login file.  F77 does not produce dumps unless you use
                     33: the '-g' flag, so this mainly eliminates dumps from other programs
                     34: and utilites.
                     35: If you do execute this, then you must execute:
                     36: 
                     37:        unlimit coredumpsize
                     38: 
                     39: if you want a dump with f77.
                     40: 
                     41: You can reduce the size of modules by stripping them:
                     42: 
                     43:        strip a.out
                     44: 
                     45: This typically saves 20-40% of the file size.  Use the strip command
                     46: only on executable modules (a.out files), not on object ('.o') files.
                     47: You can not use the debugger after stripping a module.
                     48: 
                     49: It is possible with other commands to strip local symbols from '.o' files;
                     50: this is worthwhile mainly for libraries.
                     51: See "help f77 biglibs" for details.
                     52: 
                     53: 
                     54: Put temporary files in the directory /tmp.  E.g.:
                     55: 
                     56:        a.out > /tmp/myoutput
                     57: 
                     58: Although files in /tmp may disappear at any time, they usually last
                     59: through the day.
                     60: If you use /tmp, then your temporary files will disappear even if
                     61: you forget about them.
                     62: 
                     63: The following commands will strip off the sequence field (cols 73-80)
                     64: and any trailing blanks from all the .f files in a directory:
                     65: 
                     66: .nf
                     67:        foreach i ( *.f )
                     68:          colrm 73 < $i   |    sed -e 's/  *$//' > tmp
                     69:          /bin/mv tmp $i
                     70:        end
                     71: .fi
                     72: 
                     73: Note there are two blanks before the asterisk in the sed command.
                     74: 
                     75: In rare circumstances, when tabs are used before the statement
                     76: body field and the line contains part of a Hollerith, stripping
                     77: trailing blanks is unsafe.  See "help f77 source" for an example.

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