By Mendel Cooper
This can be the whole reference at the Borne back shell (bash). quantity 1Volume 2 comprises all appendices.
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Extra info for Advanced Bash-Scripting Guide
This is an example of arithmetic expansion. z=`expr substr $string $position $length` Extract substring of $length characters, starting at $position. Example 12-6. /bin/bash # Demonstrating some of the uses of 'expr' # ======================================= echo # Arithmetic Operators # ---------- --------echo "Arithmetic Operators" echo a=`expr 5 + 3` echo "5 + 3 = $a" a=`expr $a + 1` echo echo "a + 1 = $a" echo "(incrementing a variable)" a=`expr 5 % 3` # modulo echo echo "5 mod 3 = $a" echo echo # Logical Operators # ------- --------# Returns 1 if true, 0 if false, #+ opposite of normal Bash convention.
Chmod Changes the attributes of an existing file (see Example 11-9). chmod +x filename # Makes "filename" executable for all users. chmod u+s filename # Sets "suid" bit on "filename" permissions. # An ordinary user may execute "filename" with same privileges as the file's owner. ) chmod 644 filename # Makes "filename" readable/writable to owner, readable to # others # (octal mode). chmod 1777 directory-name # Gives everyone read, write, and execute permission in directory, # however also sets the "sticky bit".
It does a literal string search (no regular expressions), which allegedly speeds things up a bit. agrep extends the capabilities of grep to approximate matching. The search string may differ by a specified number of characters from the resulting matches. This utility is not part of the core Linux distribution. To search compressed files, use zgrep, zegrep, or zfgrep. These also work on non-compressed files, though slower than plain grep, egrep, fgrep. They are handy for searching through a mixed set of files, some compressed, some not.
Advanced Bash-Scripting Guide by Mendel Cooper