A bash wrapper for GCC. You need >=GCC-4.6.0 and BOOST for all features to work.
For GCC older than 4.4.4, remove -std=gnu++0x from CXXFLAGS variable (top of scc file).
Examples:
C++ expression evaluated and printed:
scc 2+2 4
If snippet have bash special characters (quotes, ;, (), <, >, <<, >>, &, |) — put it in quotes:
scc '"hello world"' "hello world" scc 'sin(0.5)' 0.479426
Now multi-statement and with explicit printing. Note trailing semicolon - meaning do not print last statement-expression:
scc 'float x=0.5; cout << x << " " << sin(x) << endl;' 0.5 0.479426
Same with SCC’s underline-print (replaces std::cout). See Simple.h section about full details.
scc 'float x=0.5; __ x ^ sin(x);' 0.5 0.479426
Square an array. C++0x is on by default. Needs current (>=4.6.0) GCC. STL containers are printable:
scc 'vector<int> V{1,2,3}; for(int& v:V) v*=v; V'
{1, 4, 9}
Word frequencies (S is shortcut for std::string):
echo aa bb aa | scc 'S w; map<S,int> M; while(cin>>w) M[w]++; M'
{⟨aa,2⟩, ⟨bb,1⟩}
Sum-up df’s used-disk-space column.
Shortcut WRL is while(read_line()).
F is class derived from deque<str>. Every input line is split into F.
Type str can be directly converted to/from numeric types.
The operator() is safe vertion of operator[].
df | scc 'int n=0; WRL n+=F(2); n' 31399199
Prepend line number to every line.
Option -p is similar to PERL’s; NR - number of record;
echo -e 'aaa\nbbb' | scc -p 'F.push_front(NR);' 0 aaa 1 bbb
Another way for doing the same. Note no trailing semicolon:
echo -e 'aaa\nbbb' | scc -p NR 0 aaa 1 bbb
Make comma separated fields out of space separated.
Option -o sets OFS (output field separator)
echo 1 2 3 | scc -o '","' -p 1,2,3
Read CSV file with quoted fields (spaces, commas and escaped quotes in field are allowed):
Option -i sets IFS (input field separator); CSV - predefined regex constant.
How to make your own regexes for IFS - look in scc.h
echo '"aa", "bb\"-, bb", "cc"' | scc -i CSV -o '"\n"' -p aa bb\"-, bb cc
Replace "-", "none" and empty fields with "n/a" in 2nd column with boost::regex.
Boost use in SCC is optional, it will be used if /usr/include/boost exist.
RR is shortcut for boost::regex_replace; R - boost::regex
echo -e '1 -\n2\n3 none\n4 abc' | scc -p 'F(1)=RR(F(1),R("^(none|-)?$"),"n/a");'
1 n/a
2 n/a
3 n/a
4 abc