Sample code for 30+ languages & platforms
C

Set a Remote File's POSIX Permissions

See more SFTP Examples

Demonstrates the Chilkat SFtp.SetPermissions method, which sets the POSIX permission bits of a remote item. The arguments are the remote path (or handle), whether the first argument is a handle, and the permission bits. Pass the permission bits only, not the file-type bits.

Background: This is the SFTP equivalent of chmod. Common values, written as octal, are 0644 for a normal file, 0600 for a private file, and 0755 for an executable or a directory. In languages without octal literals the same values must be given in decimal or hexadecimal (for example 0755 is decimal 493). Setting an executable bit after uploading a script is the classic use.

Chilkat C Downloads

C
#include <C_CkSFtp.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSFtp sftp;
    int port;
    const char *password;
    BOOL isHandle;
    int permissions;

    success = FALSE;

    //  Demonstrates the SFtp.SetPermissions method, which sets the POSIX permission bits of a remote
    //  item.  The 1st argument is the remote path (or handle), the 2nd (isHandle) indicates which,
    //  and the 3rd is the permission bits.

    sftp = CkSFtp_Create();

    //  Connect, authenticate, and initialize the SFTP subsystem.
    port = 22;
    success = CkSFtp_Connect(sftp,"sftp.example.com",port);
    if (success == FALSE) {
        printf("%s\n",CkSFtp_lastErrorText(sftp));
        CkSFtp_Dispose(sftp);
        return;
    }

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    password = "mySshPassword";

    success = CkSFtp_AuthenticatePw(sftp,"mySshLogin",password);
    if (success == FALSE) {
        printf("%s\n",CkSFtp_lastErrorText(sftp));
        CkSFtp_Dispose(sftp);
        return;
    }

    success = CkSFtp_InitializeSftp(sftp);
    if (success == FALSE) {
        printf("%s\n",CkSFtp_lastErrorText(sftp));
        CkSFtp_Dispose(sftp);
        return;
    }

    //  The 1st argument is a path, so isHandle is FALSE.
    isHandle = FALSE;

    //  Pass the permission bits, not the file-type bits.  0755 gives the owner read/write/execute and
    //  read/execute to group and others -- a common mode for an executable script.
    permissions = 493;
    success = CkSFtp_SetPermissions(sftp,"subdir/script.sh",isHandle,permissions);
    if (success == FALSE) {
        printf("%s\n",CkSFtp_lastErrorText(sftp));
        CkSFtp_Dispose(sftp);
        return;
    }

    printf("Permissions set.\n");

    CkSFtp_Disconnect(sftp);


    CkSFtp_Dispose(sftp);

    }