check(8) - phpMan

drwebd (1)           - DrWeb Daemon checks files for viruses.
access (2)           - check real user's permissions for a file
aspell (1)           - interactive spell checker
body_checks (5)      - Postfix built-in content inspection
btrfs-check (8)      - check or repair an unmounted btrfs filesystem
btrfs-scrub (8)      - scrub btrfs filesystem, verify block checksums
btrfsck (8)          - check or repair an unmounted btrfs filesystem
cache_check (8)      - validates cache metadata on a device or file.
checkmodule (8)      - SELinux policy module compiler
checkpolicy (8)      - SELinux policy compiler
cksum (1)            - checksum and count the bytes in a file
cksum (1p)           - write file checksums and sizes
clearerr (3)         - check and reset stream status
cracklib-check (8)   - Check passwords using libcrack2
create-cracklib-dict (8) - Check passwords using libcrack2
db_checkpoint (1)    - Periodically checkpoint transactions
dnssec-checkds (8)   - DNSSEC delegation consistency checking tool
dnssec-coverage (8)  - checks future DNSKEY coverage for a zone
dosfsck (8)          - check and repair MS-DOS filesystems
e2fsck (8)           - check a Linux ext2/ext3/ext4 file system
eaccess (3)          - check effective user's permissions for a file
enchant (1)          - a spellchecker
era_check (8)        - validate era metadata on device or file.
euidaccess (3)       - check effective user's permissions for a file
ExtUtils::Manifest (3pm) - utilities to write and check a MANIFEST file
faccessat (2)        - check user's permissions of a file relative to a direc...
feof (3)             - check and reset stream status
ferror (3)           - check and reset stream status
fileno (3)           - check and reset stream status
fipscheck (8)        - perform a FIPS-140-2 validation check of one or more f...
fipshmac (8)         - create FIPS-140-2 validation checksum files
fsadm (8)            - utility to resize or check filesystem on a device
fsck (8)             - check and repair a Linux filesystem
fsck.ext2 (8)        - check a Linux ext2/ext3/ext4 file system
fsck.ext3 (8)        - check a Linux ext2/ext3/ext4 file system
fsck.ext4 (8)        - check a Linux ext2/ext3/ext4 file system
fsck.fat (8)         - check and repair MS-DOS filesystems
fsck.minix (8)       - check consistency of Minix filesystem
fsck.msdos (8)       - check and repair MS-DOS filesystems
fsck.vfat (8)        - check and repair MS-DOS filesystems
git-check-attr (1)   - Display gitattributes information
git-check-ignore (1) - Debug gitignore / exclude files
git-check-ref-format (1) - Ensures that a reference name is well formed
git-checkout (1)     - Checkout a branch or paths to the working tree
git-checkout-index (1) - Copy files from the index to the working tree
git-verify-tag (1)   - Check the GPG signature of tags
grub2-script-check (1) - Check GRUB configuration file for syntax errors.
grub2-file (1)       - Check if FILE is of specified type.
header_checks (5)    - Postfix built-in content inspection
hunspell (1)         - spell checker, stemmer and morphological analyzer
innochecksum (1)     - offline InnoDB file checksum utility
Mail::SpamAssassin::Plugin::AccessDB (3pm) - check message against Access Dat...
Mail::SpamAssassin::Plugin::Check (3pm) - primary message check functionality
Mail::SpamAssassin::Plugin::DCC (3pm) - perform DCC check of messages
Mail::SpamAssassin::Plugin::Pyzor (3pm) - perform Pyzor check of messages
Mail::SpamAssassin::Plugin::Razor2 (3pm) - perform Razor check of messages
Mail::SpamAssassin::Plugin::Reuse (3pm) - For reusing old rule hits during a ...
mcheck (3)           - heap consistency checking
mcheck_check_all (3) - heap consistency checking
mcheck_pedantic (3)  - heap consistency checking
md5sum (1)           - compute and check MD5 message digest
mprobe (3)           - heap consistency checking
mysql_upgrade (1)    - check tables for MySQL upgrade
mysqlaccess (1)      - client for checking access privileges
mysqlcheck (1)       - a table maintenance program
named-checkconf (8)  - named configuration file syntax checking tool
named-checkzone (8)  - zone file validity checking or converting tool
named-compilezone (8) - zone file validity checking or converting tool
named-rrchecker (1)  - syntax checker for individual DNS resource records
Net::Ping (3pm)      - check a remote host for reachability
nss-policy-check (1) - nss-policy-check policy-file
pam_cracklib (8)     - PAM module to check the password against dictionary words
pam_postgresok (8)   - simple check of real UID and corresponding account name
pam_pwquality (8)    - PAM module to perform password quality checking
pam_shells (8)       - PAM module to check for valid login shell
pam_timestamp_check (8) - Check to see if the default timestamp is valid
Params::Check (3pm)  - A generic input parsing/checking mechanism.
pathchk (1)          - check whether file names are valid or portable
pathchk (1p)         - check pathnames
pkcheck (1)          - Check whether a process is authorized
pkla-check-authorization (8) - Evaluate pklocalauthority authorization config...
Pod::Perldoc::ToChecker (3pm) - let Perldoc check Pod for errors
Pod::Simple::Checker (3pm) - - check the Pod syntax of a document
pvck (8)             - Check the consistency of physical volume(s)
pwscore (1)          - simple configurable tool for checking quality of a pas...
setfsgid (2)         - set group identity used for file system checks
setfsgid32 (2)       - set group identity used for file system checks
setfsuid (2)         - set user identity used for file system checks
setfsuid32 (2)       - set user identity used for file system checks
sha1sum (1)          - compute and check SHA1 message digest
sha224sum (1)        - compute and check SHA224 message digest
sha256sum (1)        - compute and check SHA256 message digest
sha384sum (1)        - compute and check SHA384 message digest
sha512sum (1)        - compute and check SHA512 message digest
shasum (1)           - Print or Check SHA Checksums
sort (1p)            - sort, merge, or sequence check text files
sum (1)              - checksum and count the blocks in a file
systemd-fsck (8)     - File system checker logic
systemd-fsck-root.service (8) - File system checker logic
systemd-fsck@.service (8) - File system checker logic
systemd-quotacheck (8) - File system quota checker logic
systemd-quotacheck.service (8) - File system quota checker logic
tc-csum (8)          - checksum update action
test (1)             - check file types and compare values
thin_check (8)       - validates thin provisioning metadata on a device or file
vgck (8)             - Check the consistency of volume group(s)
xfs_ncheck (8)       - generate pathnames from i-numbers for XFS