Wikipedia:Reference desk/Computing

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command.com
cmd.exe
su -
sudo bash
convert
Can anyone tell me ? What is the purpose of using  pointer to function?

void qsort( void *buf, size_t num, size_t size, int (*compare)(const void *, const void *) );

void* buf
Private Sub CmdAddRecord_Click()
On Error GoTo Err_CmdAddRecord_Click

    DoCmd.GoToRecord , , acNewRec
    'Prevent user warnings
  DoCmd.SetWarnings False

Dim SQL As String
SQL = "INSERT INTO Table![Merchant CCF]([Customer Name], [Merchant Type], Partner, [Merchant Sector]) SELECT [Merchant Name], [Merchant Type], Partner, [Merchant Sector] FROM Table![Main Table]"

    DoCmd.RunSQL SQL

'Allow user warnings
  DoCmd.SetWarnings True

Exit_CmdAddRecord_Click:
    Exit Sub

Err_CmdAddRecord_Click:
    MsgBox Err.Description
    Resume Exit_CmdAddRecord_Click

End Sub

Private Sub Command83_Click()

Dim strSQL As String
Dim strCriteria As String

strSQL = ""
strSQL = strSQL & " INSERT INTO tblMerchant_CCF ([Merchant Name],[Merchant Type],[Partner],[Merchant Sector]),"
strSQL = strSQL & " SELECT ([Merchant Name],[Merchant Type],[Partner],[Merchant Sector]),"
strSQL = strSQL & " FROM tblMain_Table"
strSQL = strSQL & " WHERE (((tblMain_Table.ID) = me.ID AND ((tblMerchant_CCF.Test_ID) = me.Test_ID)))"
DoCmd.RunSQL strSQL

End Sub#

Private Sub Command83_Click()

Dim strSQL As String
Dim strCriteria As String

strSQL = ""
strSQL = strSQL & " INSERT INTO Table![Merchant CCF]([Merchant Name],[Merchant Type],[Partner],[Merchant Sector])"
strSQL = strSQL & " SELECT ([Merchant Name],[Merchant Type],[Partner],[Merchant Sector])"
strSQL = strSQL & " FROM Table![Main table]"
strSQL = strSQL & " WHERE (((Table![Main table](ID)) IN ' & 1-5000 & ' AND ((Table![Merchant CCF](Test_ID)) IN ' & 1-5000  & ')));"
DoCmd.RunSQL (strSQL = [Yes])

End Sub

DoCmd.RunSQL strSQL

Private Sub Command83_Click()

Dim strSQL As String
Dim strCriteria As String

strSQL = ""
strSQL = strSQL & " INSERT INTO [Merchant CCF]([Merchant Name][Merchant Type][Partner][Merchant Sector])"
strSQL = strSQL & " SELECT ([Merchant Name][Merchant Type][Partner][Merchant Sector])"
strSQL = strSQL & " FROM [Main table]"
strSQL = strSQL & " WHERE ((([Main table](ID)) BETWEEN 1 AND 5000 AND (([Merchant CCF](Test_ID)) BETWEEN 1 AND 5000)));"
strSQL = strSQL & "MsgBox strSQL"
DoCmd.RunSQL strSQL, False

End Sub

...
strSQL = "INSERT INTO [Merchant CCF] ([Merchant Name], [Merchant Type], [Partner], [Merchant Sector])"
strSQL = strSQL & " SELECT ([Merchant Name], [Merchant Type], [Partner], [Merchant Sector])"
strSQL = strSQL & " FROM [Main table]"
strSQL = strSQL & " WHERE ( ([Main table].ID BETWEEN 1 AND 5000) AND ([Merchant CCF].Test_ID BETWEEN 1 AND 5000) )"
MsgBox strSQL
DoCmd.RunSQL strSQL
...

<circle id="0_logo" cx="190" cy="405" r="10"
style="fill:#000000;stroke:#FFFFFF;stroke-width:2;fill-opacity:0.1;stroke-opacity:1;"/>

<circle fill="url(#grad)" cx="410" cy="285" r="30"/>

<use xlink:href="#0_logo"/>

/home/rksh/scratch/gcc/host-x86_64-unknown-linux-gnu/gcc/xgcc -B/home/rksh/scratch/gcc/host-x86_64-unknown-linux-gnu/gcc/ -B/usr/local/x86_64-unknown-linux-gnu/bin/ -B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/x86_64-unknown-linux-gnu/include -isystem /usr/local/x86_64-unknown-linux-gnu/sys-include    -g -O2 -m32 -O2  -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED   -I. -I. -I../../../host-x86_64-unknown-linux-gnu/gcc -I../../.././libgcc -I../../.././libgcc/. -I../../.././libgcc/../gcc -I../../.././libgcc/../include -I../../.././libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep -DL_muldi3 -c ../../.././libgcc/../gcc/libgcc2.c \
          -fvisibility=hidden -DHIDE_EXPORTS
In file included from /usr/include/features.h:371:0,
                from /usr/include/stdio.h:28,
                from ../../.././libgcc/../gcc/tsystem.h:87,
                from ../../.././libgcc/../gcc/libgcc2.c:29:
/usr/include/gnu/stubs.h:7:27: fatal error: gnu/stubs-32.h: No such file or directory
compilation terminated.
make[5]: *** [_muldi3.o] Error 1
make[5]: Leaving directory `/home/rksh/scratch/gcc/x86_64-unknown-linux-gnu/32/libgcc'
make[4]: *** [multi-do] Error 1
make[4]: Leaving directory `/home/rksh/scratch/gcc/x86_64-unknown-linux-gnu/libgcc'
make[3]: *** [all-multi] Error 2
make[3]: Leaving directory `/home/rksh/scratch/gcc/x86_64-unknown-linux-gnu/libgcc'
make[2]: *** [all-stage1-target-libgcc] Error 2
make[2]: Leaving directory `/home/rksh/scratch/gcc'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/home/rksh/scratch/gcc'
make: *** [all] Error 2
HPS223:~/scratch/gcc%

curl
int**
const int**
int *p;
const int ans=42,**qa;
qa=&p;    /* not allowed */
*qa=&ans; /* because this makes p point to a const int */
*p=0;     /* which we could then modify */

int**
int*const*
const int*const*
const int
int sum(const int *const *a) { /* or const int *const a[KNOWN] */
  int i,j,ret=0;
  for(i=0;i<KNOWN;++i)
    for(j=0;j<2*i+1;++j) ret+=a[i][j];
  return ret;
}

#define KNOWN 3
int flat[]={0,1,2,3,5,8,13,21,34},*const iv[]={flat,flat+1,flat+4};
++iv[0][0];
return sum(iv); /* warning: passing argument 1 of ‘sum’ from incompatible pointer type */

int *
int const *
sizeof(int *) == sizeof(int const *)
int
double
int const *
double const *
T* const*
const int*
int*
sum()
sum()
const
const int *
int *
int *
const int *
const int *
int *
g++
const
struct mystruct
{
  char *p;
  int i;
 };
 struct mystruct *blob = malloc(sizeof(struct mystruct));

int n,i;
float *a;
printf("How many questions are on the math test? ");
scanf("%d",&n); /* give scanf() a pointer to n so it can assign to n through it */
a=malloc(n*sizeof*a); /* enough space for n floats; *a is a float, so sizeof*a==sizeof(float) */
printf("What are the answers? ");
for(i=0;i<n;++i) scanf("%g",a+i); /* a[i]==*(a+i), so a+i==&a[i] and we store into each in turn */

float*
float**
int nt,*nq,i,j;
float **a;
printf("How many math tests? ");
scanf("%d",&nt);
a=malloc(nt*sizeof*a);   /* enough space for nt float _pointers_ */
nq=malloc(nt*sizeof*nq); /* enough space for nt ints */
for(i=0;i<nt;++i) {
  printf("How many questions are on test #%d? ",i);
  scanf("%d",nq+i);
  a[i]=malloc(nq[i]*sizeof*a[i]); /* enough space for nq[i] floats */
  printf("What are the answers? ");
  for(j=0;j<nq[i];++j) scanf("%g",a[i]+j);
}

struct
struct test {int n; float *ans;};
int nt,i,j;
struct test *a;
printf("How many math tests? ");
scanf("%d",&nt);
a=malloc(nt*sizeof*a); /* enough space for nt test structures */
for(i=0;i<nt;++i) {
  printf("How many questions are on test #%d? ",i);
  scanf("%d",&a[i].n);
  a[i].ans=malloc(a[i].n*sizeof*a[i].ans); /* enough space for a[i].n floats */
  printf("What are the answers? ");
  for(j=0;j<a[i].n;++j) scanf("%g",a[i].ans+j);
}

->
struct test {int n; float *ans;};
int nt,i,j;
struct test *a,*current;
printf("How many math tests? ");
scanf("%d",&nt);
a=malloc(nt*sizeof*a); /* enough space for nt test structures */
for(i=0;i<nt;++i) {
  current=a+i; /* point at the i-th element of the array; no new object is created here! */
  printf("How many questions are on test #%d? ",i);
  scanf("%d",&current->n);
  current->ans=malloc(current->n*sizeof*current->ans); /* enough space for current->n floats */
  printf("What are the answers? ");
  for(j=0;j<current->n;++j) scanf("%g",current->ans+j);
}

for(...)
struct test {int n; float *ans;};
int nt;
struct test *a,*current,*end;
printf("How many math tests? ");
scanf("%d",&nt);
a=malloc(nt*sizeof*a); /* enough space for nt test structures */
end=a+nt;              /* points just past the end of a */
for(current=a;current<end;++current) {
  float *fcurrent,*fend;
  printf("How many questions are on test #%d? ",current-a); /* you can still get the index if you want */
  scanf("%d",&current->n);
  current->ans=malloc(current->n*sizeof*current->ans); /* enough space for a[i].n floats */
  fend=current->ans+current->n; /* points just past the end of current->ans */
  printf("What are the answers? ");
  for(fcurrent=current->ans;fcurrent<fend;++fcurrent) scanf("%g",fcurrent);
}

float **
struct test {int n; float *ans;};
int nt;
struct test *a,*current,*end;
printf("How many math tests? ");
scanf("%d",&nt);
a=malloc(nt*sizeof*a); /* enough space for nt test structures */
end=a+nt;              /* points just past the end of a */
for(current=a;current<end;++current) {
  float *fcurrent,*fend,**fpp=&current->ans;
  int *ip=&current->n;
  printf("How many questions are on test #%d? ",current-a); /* you can still get the index if you want */
  scanf("%d",ip); /* this assigns to current->n, so we'll have the number later, but we can also call it *ip now */
  *fpp=malloc(*ip*sizeof**fpp); /* enough space for *ip floats */
  fend=*fpp+*ip; /* points just past the end of *fpp */
  printf("What are the answers? ");
  for(fcurrent=*fpp;fcurrent<fend;++fcurrent) scanf("%g",fcurrent);
}

current
scanf()
myStaticArray[3][5].structMember[2]
PS223:~/Downloads/emacs-23.2% make
cd lib-src; make all                            \
         CC='gcc' CFLAGS='-g -O2 -Wdeclaration-after-statement -Wno-pointer-sign  ' CPPFLAGS='-D_BSD_SOURCE  ' \
         LDFLAGS='-Wl,-znocombreloc  ' MAKE='make'
make[1]: Entering directory `/home/rksh/Downloads/emacs-23.2/lib-src'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/rksh/Downloads/emacs-23.2/lib-src'
boot=bootstrap-emacs;                         \
       if [ ! -x "src/$boot" ]; then                                     \
           cd src; make all                                    \
             CC='gcc' CFLAGS='-g -O2 -Wdeclaration-after-statement -Wno-pointer-sign  ' CPPFLAGS='-D_BSD_SOURCE  '         \
             LDFLAGS='-Wl,-znocombreloc  ' MAKE='make' BOOTSTRAPEMACS="$boot"; \
       fi;
cd src; make all                            \
         CC='gcc' CFLAGS='-g -O2 -Wdeclaration-after-statement -Wno-pointer-sign  ' CPPFLAGS='-D_BSD_SOURCE  ' \
         LDFLAGS='-Wl,-znocombreloc  ' MAKE='make' BOOTSTRAPEMACS=""
make[1]: Entering directory `/home/rksh/Downloads/emacs-23.2/src'
make[1]: *** No rule to make target `/usr/local/include/gtk-2.0/gtk/gtk.h', needed by `dispnew.o'.  Stop.
make[1]: Leaving directory `/home/rksh/Downloads/emacs-23.2/src'
make: *** [src] Error 2
HPS223:~/Downloads/emacs-23.2% 

configure
configure.in
netstat -b
netstat -b
netstat -no
netstat -b
netstat -b
netstat -b
echo "There are $number pages";

$fp = fopen("your_file.html","w");

fputs($fp, "There are $number pages");

fclose($fp);
<?php echo "there are $number pages"; ?>
/usr/share/doc/packagename/copyright
copyright
dpkg-query -l
dpkg-query -L packagename
dpkg --get-selections|wc -l
find /usr/share/doc -iname "*copyright*"| wc -l
copyright
dpkg-query -l | wc -l
ls -R /usr/share/doc | grep -i copyright | wc -l
copyright
/usr/share/doc/packagename/copyright

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