Shell

• sed, tr (-d flag), expr, grep, cut (-d delimiter),
• if, while loops
• operators: - <, >, ==, !=, etc., -eq, -le, -lt, etc., -f -d, -w, -x, -r, &c, &&, ||
• for loopS (different from other languages)
• '' vs "" vs ``
• setting variables
• piping things together
• true vs false w.r.t. integer values
• $$ vs $? vs $0, $1, $2, $..., $#
• shift (to move the parameter window)
• set
• use of {} vs. string concatenation

Perl

• regex, match and extract and replace
• default string
• array stuff
• for each
• while w/regex

AWK

• regex
• BEGIN and END
• printf
• $0, $1...$n,
• FS, RS, NR, NF,

RegEx

• create a regex to match exactly BLAH
• give three examples of strings that match regex BLAH, or don't match
• extended or regular, distinguish

C Stuff

• Stuff similar to Java
• compilation process
• static functions, staticv "globals", static "locals"
• extern and prototypes
• code organization (files, redefinition, linking problems, ifndef)
• pointers
• pointer arithmatic
• strings, null termination, as arrays
• strcpy, strncpy, strlen
• sizeof
• pass by reference (pass by address) idiom
• malloc/calloc and free
• allocating and freeing space w/in a function (for use elsewhere)
• #define #ifndef, #ifdef
• #include <> vs ""
• formatted (high level) I/O: scanf, printf, fopen, fclose, fprintf, fscanf, fgets, fputs
  • puts terminates with new line, fputs does not
  • DON'T USE gets
  • typedef
  • struct; .-operator, ->-operator, sizeof()