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Shell Programming and Scripting
Extracting .tar.gz files
Post 302985127 by Scrutinizer on Saturday 5th of November 2016 05:27:00 PM
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Hi folks,
When I am extracting an archive using the:
tar -xvf /dev/rmt0 command i get the following error:
x ./GRBD8901/GRBR006T, 1763253368 bytes, 3443855 media blocks.
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so i have hundreds of files named history.20071112.tar
(history.YYYYMMDD.tar)
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here is what i have so far:
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do
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Hey guys complete n00b here so I'll try my best at explaining.
I'm creating a backup and restore utility and decided to use tar. I create a backup folder in each user's account and when backing up (say word processing files), I use the following:
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I have tried:
tar -xfv mytarfile.tar archive/tabv/*
tar -xfv mytarfile.tar --wildcards 'archive/tabv/*'
tar -xf mytarfile.tar -v --wildcards 'archive/tabv/*'
tar -xfv mytarfile.tar --wildcards --no-anchored 'archive/tabv/*'
tar -xfv mytarfile.tar --wildcards `archive/tabv/*`
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Is anyone out there? I'm trying to run a script i wrote that extracts multiple .tar files in succession by pasting it into standard input. It does extract them all but I cant get it to stop looping and when I hit enter I get a tar command error like its still looking for files to extract.
ie;
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Hi all,
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Hi,
I'm using a tar command
tar -xOvf /home/mytar.tar
My intention is to extract data in files which are inside various directories,
without extracting files to the disk.
Is this the best way to achieve it?
Thanks,
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In the bash below each .tar.bz2 (usually 2) are extracted and then the original .tar.bz2 is removed. However, only one (presumably the first extracted) is being removed, however both are extracted. I am not sure why this is? Thank you :).
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hello
i wish to write the result of these below conditions in a file:
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Hi Guys,
I have 2 compressed files tar.lzo and having many subdirectories inside it.
I would like to know which files having the difference in terms of size/content.
I am using bash shell and unix server
example:-
file1 :- abc.tar.lzo
file2 :- xyz.tar.lzo
Result:-
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LEARN ABOUT V7
signal-safety
SIGNAL-SAFETY(7) Linux Programmer's Manual SIGNAL-SAFETY(7) NAME
signal-safety - async-signal-safe functions DESCRIPTION
An async-signal-safe function is one that can be safely called from within a signal handler. Many functions are not async-signal-safe. In particular, nonreentrant functions are generally unsafe to call from a signal handler. The kinds of issues that render a function unsafe can be quickly understood when one considers the implementation of the stdio library, all of whose functions are not async-signal-safe. When performing buffered I/O on a file, the stdio functions must maintain a statically allocated data buffer along with associated counters and indexes (or pointers) that record the amount of data and the current position in the buffer. Suppose that the main program is in the middle of a call to a stdio function such as printf(3) where the buffer and associated variables have been partially updated. If, at that moment, the program is interrupted by a signal handler that also calls printf(3), then the second call to printf(3) will operate on incon- sistent data, with unpredictable results. To avoid problems with unsafe functions, there are two possible choices: 1. Ensure that (a) the signal handler calls only async-signal-safe functions, and (b) the signal handler itself is reentrant with respect to global variables in the main program. 2. Block signal delivery in the main program when calling functions that are unsafe or operating on global data that is also accessed by the signal handler. Generally, the second choice is difficult in programs of any complexity, so the first choice is taken. POSIX.1 specifies a set of functions that an implementation must make async-signal-safe. (An implementation may provide safe implementa- tions of additional functions, but this is not required by the standard and other implementations may not provide the same guarantees.) In general, a function is async-signal-safe either because it is reentrant or because it is atomic with respect to signals (i.e., its execu- tion can't be interrupted by a signal handler). The set of functions required to be async-signal-safe by POSIX.1 is shown in the following table. The functions not otherwise noted were required to be async-signal-safe in POSIX.1-2001; the table details changes in the subsequent standards. Function Notes abort(3) Added in POSIX.1-2003 accept(2) access(2) aio_error(3) aio_return(3) aio_suspend(3) See notes below alarm(2) bind(2) cfgetispeed(3) cfgetospeed(3) cfsetispeed(3) cfsetospeed(3) chdir(2) chmod(2) chown(2) clock_gettime(2) close(2) connect(2) creat(2) dup(2) dup2(2) execl(3) Added in POSIX.1-2008; see notes below execle(3) See notes below execv(3) Added in POSIX.1-2008 execve(2) _exit(2) _Exit(2) faccessat(2) Added in POSIX.1-2008 fchdir(2) Added in POSIX.1-2013 fchmod(2) fchmodat(2) Added in POSIX.1-2008 fchown(2) fchownat(2) Added in POSIX.1-2008 fcntl(2) fdatasync(2) fexecve(3) Added in POSIX.1-2008 ffs(3) Added in POSIX.1-2016 fork(2) See notes below fstat(2) fstatat(2) Added in POSIX.1-2008 fsync(2) ftruncate(2) futimens(3) Added in POSIX.1-2008 getegid(2) geteuid(2) getgid(2) getgroups(2) getpeername(2) getpgrp(2) getpid(2) getppid(2) getsockname(2) getsockopt(2) getuid(2) htonl(3) Added in POSIX.1-2016 htons(3) Added in POSIX.1-2016 kill(2) link(2) linkat(2) Added in POSIX.1-2008 listen(2) longjmp(3) Added in POSIX.1-2016; see notes below lseek(2) lstat(2) memccpy(3) Added in POSIX.1-2016 memchr(3) Added in POSIX.1-2016 memcmp(3) Added in POSIX.1-2016 memcpy(3) Added in POSIX.1-2016 memmove(3) Added in POSIX.1-2016 memset(3) Added in POSIX.1-2016 mkdir(2) mkdirat(2) Added in POSIX.1-2008 mkfifo(3) mkfifoat(3) Added in POSIX.1-2008 mknod(2) Added in POSIX.1-2008 mknodat(2) Added in POSIX.1-2008 ntohl(3) Added in POSIX.1-2016 ntohs(3) Added in POSIX.1-2016 open(2) openat(2) Added in POSIX.1-2008 pause(2) pipe(2) poll(2) posix_trace_event(3) pselect(2) pthread_kill(3) Added in POSIX.1-2013 pthread_self(3) Added in POSIX.1-2013 pthread_sigmask(3) Added in POSIX.1-2013 raise(3) read(2) readlink(2) readlinkat(2) Added in POSIX.1-2008 recv(2) recvfrom(2) recvmsg(2) rename(2) renameat(2) Added in POSIX.1-2008 rmdir(2) select(2) sem_post(3) send(2) sendmsg(2) sendto(2) setgid(2) setpgid(2) setsid(2) setsockopt(2) setuid(2) shutdown(2) sigaction(2) sigaddset(3) sigdelset(3) sigemptyset(3) sigfillset(3) sigismember(3) siglongjmp(3) Added in POSIX.1-2016; see notes below signal(2) sigpause(3) sigpending(2) sigprocmask(2) sigqueue(2) sigset(3) sigsuspend(2) sleep(3) sockatmark(3) Added in POSIX.1-2004 socket(2) socketpair(2) stat(2) stpcpy(3) Added in POSIX.1-2016 stpncpy(3) Added in POSIX.1-2016 strcat(3) Added in POSIX.1-2016 strchr(3) Added in POSIX.1-2016 strcmp(3) Added in POSIX.1-2016 strcpy(3) Added in POSIX.1-2016 strcspn(3) Added in POSIX.1-2016 strlen(3) Added in POSIX.1-2016 strncat(3) Added in POSIX.1-2016 strncmp(3) Added in POSIX.1-2016 strncpy(3) Added in POSIX.1-2016 strnlen(3) Added in POSIX.1-2016 strpbrk(3) Added in POSIX.1-2016 strrchr(3) Added in POSIX.1-2016 strspn(3) Added in POSIX.1-2016 strstr(3) Added in POSIX.1-2016 strtok_r(3) Added in POSIX.1-2016 symlink(2) symlinkat(2) Added in POSIX.1-2008 tcdrain(3) tcflow(3) tcflush(3) tcgetattr(3) tcgetpgrp(3) tcsendbreak(3) tcsetattr(3) tcsetpgrp(3) time(2) timer_getoverrun(2) timer_gettime(2) timer_settime(2) times(2) umask(2) uname(2) unlink(2) unlinkat(2) Added in POSIX.1-2008 utime(2) utimensat(2) Added in POSIX.1-2008 utimes(2) Added in POSIX.1-2008 wait(2) waitpid(2) wcpcpy(3) Added in POSIX.1-2016 wcpncpy(3) Added in POSIX.1-2016 wcscat(3) Added in POSIX.1-2016 wcschr(3) Added in POSIX.1-2016 wcscmp(3) Added in POSIX.1-2016 wcscpy(3) Added in POSIX.1-2016 wcscspn(3) Added in POSIX.1-2016 wcslen(3) Added in POSIX.1-2016 wcsncat(3) Added in POSIX.1-2016 wcsncmp(3) Added in POSIX.1-2016 wcsncpy(3) Added in POSIX.1-2016 wcsnlen(3) Added in POSIX.1-2016 wcspbrk(3) Added in POSIX.1-2016 wcsrchr(3) Added in POSIX.1-2016 wcsspn(3) Added in POSIX.1-2016 wcsstr(3) Added in POSIX.1-2016 wcstok(3) Added in POSIX.1-2016 wmemchr(3) Added in POSIX.1-2016 wmemcmp(3) Added in POSIX.1-2016 wmemcpy(3) Added in POSIX.1-2016 wmemmove(3) Added in POSIX.1-2016 wmemset(3) Added in POSIX.1-2016 write(2) Notes: * POSIX.1-2001 and POSIX.1-2004 required the functions fpathconf(3), pathconf(3), and sysconf(3) to be async-signal-safe, but this requirement was removed in POSIX.1-2008. * If a signal handler interrupts the execution of an unsafe function, and the handler terminates via a call to longjmp(3) or siglongjmp(3) and the program subsequently calls an unsafe function, then the behavior of the program is undefined. * POSIX.1-2003 clarified that if an application calls fork(2) from a signal handler and any of the fork handlers registered by pthread_atfork(3) calls a function that is not async-signal-safe, the behavior is undefined. A future revision of the standard is likely to remove fork(2) from the list of async-signal-safe functions. Deviations in the GNU C library The following known deviations from the standard occur in the GNU C library: * Before glibc 2.24, execl(3) and execle(3) employed realloc(3) internally and were consequently not async-signal-safe. This was fixed in glibc 2.24. * The glibc implementation of aio_suspend(3) is not async-signal-safe because it uses pthread_mutex_lock(3) internally. SEE ALSO
sigaction(2), signal(7), standards(7) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2017-03-13 SIGNAL-SAFETY(7)